Bypass in the heating system, what is it: the correct, independent installation of the bypas in the heating system

Have you ever questioned why the temperature in your house isn’t constant or why your heating costs are higher than they ought to be? Your heating system’s missing or incorrectly installed bypass could be one of the causes. This post will explain what a bypass is, why your heating system needs one, and how to install one safely and independently to increase the heating efficiency in your house.

A heating system’s bypass is a basic yet essential part that keeps the system’s water pressure and flow operating as intended. Your heating system might have trouble distributing heat throughout your house uniformly without a bypass, which could result in cold spots and inefficiencies. Additionally, by ensuring that water flows smoothly even when some zones are closed off, a properly installed bypass can help prevent damage to your boiler or other heating equipment.

Your heating system’s bypass installation doesn’t have to be a difficult undertaking. You can do this yourself and possibly save money on long-term heating bills if you have the necessary knowledge and a few basic tools. We’ll take you step-by-step through the proper installation of a bypass in your heating system in the ensuing sections.

Installing a bypass could be the answer you’re looking for if you’re having problems with uneven heating, high energy bills, or just want to make sure your heating system is running as efficiently as possible. As we walk you through the process of installing this crucial part for your home’s heating system, please follow along.

Bypas design

The bypass mechanism is easy to use. The bypass device’s structural components are as follows: circulation pump, CREARY FILITOR, and COURAL ARMAMATION.

The heating system’s bypass can run continuously or only occasionally when the radiators are first turned on. The following components can be utilized as system shut-off valves: ball valves and check valves. As a result, it is thought that the heating system needs a check valve. A check valve may be installed in place of a tap in the heating system.

In this instance, the return valve is in a closed state mode when the circulation pump is included. The valve automatically opens to let the system enter natural circulation mode when the electricity is turned off. As a result, the Bypas design’s locking reinforcement decision is a fundamental one. When there is no valve, the highway and bypass form the small heating contour, which is where the circulation pump is included.

A ball that overlaps the lumen and a spring-loaded plate should be included in the check valve’s design. One benefit of having a check valve in the system is that it can operate without a person’s involvement or presence. The valve is "closed" when the circulation pump is included and the coolant mixture pressure is applied. However, because there are abrasive impurities in the coolant mixture, the valve’s dependability of operation is lower than that of the valve itself.

The best course of action, according to professionals installing shut-off valves, is to buy a valve from one of the top manufacturers, as flowing ball valves are not repairable.

Tips and recommendations

Prior to installing bypas in an apartment building’s heating system, it is necessary to first give written notice to the local housing and communal services representatives regarding the temporary disconnection of the coolant supply from the boiler room. Following that, heed the advice given below:

In order for water to enter the heating device normally, that the diameter of the pipe of the bypass is one size less than in the general circuit.
By purchasing a ready -made bypass node, it is necessary to require a quality certificate that will serve as a guarantee of durable and normal operation of the device.
When buying elements of the bypass site, threaded joints should be checked – they must be easily unscrewed and do not scroll through when tightening.
deciding to mount the bypass, use only ball valves, since they have not only low hydraulic resistance, but also easily open and close.
It doesn’t matter whether the bypass works or not, it is necessary to open and close all the taps from time to time to avoid the bell of the ball and significantly increase the life of all elements of the node.
Before putting heating into operation after prolonged downtime, you must certainly break the plot with a circulation pump.
Throughout the heating season, the preventive cleaning of filters installed in the bypass system should be performed.
in order to avoid errors, and in order for the heating to work efficiently, it is advisable to entrust all the work to an experienced specialist.

Instances of bypass installations

Bypass for the radiator in a one -pipe heating highway

Installing a bypass in the heating system parallel to the battery not only makes it possible to replace or repair the heat device without interrupting the heating system’s operation—a particularly useful feature in apartment buildings—but it also lets you modify the fluid flow through the system and, consequently, the temperature regime. How do I properly install a bypass?

As we examine the image, we can see that these kinds of systems resemble this.

The bypass photo on the left is simply a regular jumper connected to the supply (hot) and reverse (cold) pipes right next to the battery.

Ball valves are installed between the radiator and the jumper. They are the ones who enable you to switch off an independent gadget, after which the coolant will quietly flow through the parallel bypass route.

You can modify the bypass mode, or the balance of fluid flow through the bypass pipe and heating battery, by installing the third crane on the jumper itself. The complete coolant flow through this heater is circulated when the crane is closed. It is optional to install a thermostat that controls the temperature in front of the radiator in place of a tap on a supply pipe.

Installing a bypass for a heated towel rail is advised in homes with central heating because many models of this type of device might not be made to fit the specifications of our boiler rooms. Simultaneously, the bypass diameter—typically a half-inch pipe—is chosen to be smaller than the diameter of the main pipes.

Why is there a bypass? It enables you to limit the quantity of coolant that enters the radiator, hence lowering energy consumption. As a result, less heat is transferred by the heating battery, saving energy. the incapacity to mitigate the risk of overheating the building when windows are opened later and the temperature rises. Boiler bypass heat exchangers allow you to change the required coolant flow rate through them.

You will leave a sizable sum of money in your pocket after setting the bypass yourself (assuming you know how to do plumbing work).

Bypass valve operation principle

In the event of an abnormal circumstance, such as a pump malfunction or power outage, the pressure drops and the valve automatically blocks the jumper to allow the water to flow naturally. This enables the heating system to be fully automated. Absence of an automatic bypass makes it vulnerable to minute pollutants and water weaving. It is advised to clean the ABD water supply prior to installation in order to get rid of rust in radiators and pipes and raids.

Prior to beginning construction, the water supply system’s material must be chosen. When using divine joints for polypropylene pipes, they first gather the bypass and the pump unit. Tees installed in the main pipe are used to connect the branch. When using steel design, the bypas valve is soldered after the nozzles. Installing the bypass system requires assembly in a specific order and is done with the coolant in mind.

  • Filter;
  • Check valve;
  • Forced action.

The return diameter and the Bypas line passage diameter ought to be the same. Experts advise installing taps with collapsible fittings on every one of them. In this instance, a number of circumstances will be resolved throughout the repair.

Principle of operation for bypass valves

Lowering the coolant level in the system is a prerequisite before beginning the pump installation. Depending on the pipe’s stroke, the entire structure is oriented so that the output pipelines are either vertically or horizontally.

The bypass line’s operation:

  • Collect a section of the contour, which will be located parallel to the highway;
  • From the return, cut off a section equal to the length of the contour;
  • The tees are installed on the ends of the highway;
  • Between them, a plot with shut -off valve or valve is mounted between them;
  • Contact the assembled section of the contour with the trunk with pipes equal in length.

It is important to allow room during installation in case the pump and other components need to be disassembled later. It is imperative that the installation be done correctly by aligning the coolant current with the arrow on the case.

Types and structures

The bypass valves with spring and membrane structures are differentiated based on the principles of action. In systems where the pipeline’s cross section is less than 200 mm, spring mechanisms are more common. In other water supply and heating networks, the lever-carbon principle is employed.

When working with liquid-watering media that contains solid particles, membrane units are being utilized more and more.

The bypass devices are designed for the following uses, depending on the pipeline environment:

They serve the following purposes for the system: pipelines

  • cold water supply,
  • hot water supply,
  • heating,
  • cooling,
  • air conditioning.

The function of bypass valves in water supply and heating systems is distinct:

  • for radiators;
  • for boiler and bypas;
  • for automatic feeding;
  • for low or high pressures.

An overflow valve with a setting scale is seen in this picture. Designed for installation in central heating systems, this piece is made of brass and bronze.

Installed alongside the bypass regulators is the heating structure:

  • air vent to prevent air plugs in pipes;
  • a three -way valve for mixing or separating hot and cold water flows;
  • reverse, preventing reverse flow in the pipeline.

Structures with a flange connection and a conditional diameter DN up to 500 mm are used for industrial and communal networks.

There are access devices in the car for:

  • turbines;
  • fuel supply mechanism;
  • engine cooling systems.

Pressure in the collector is decreased by the turbine’s bypass node, which releases gas exhaust. It prevents the engine from overheating in this way.

Connection of the pump via bypass

Only those systems that were initially intended for natural circulation—that is, those with an accelerated manifold, pipe slopes, and appropriately chosen diameters—should connect the circulation pump through the bypass. In these kinds of systems, the purpose of the pump is to boost efficiency rather than guarantee system operation.

Bypass is just unnecessary for systems that were still intended to have forced circulation during the design phase. Coolant circulation simply stops when the pump is disconnected because these systems only function at the pump’s expense. In this instance, a bypass won’t be able to address the issue.

It is possible to prevent flow in the bypass when the pump is connected through the bypass line. Furthermore, a closed circulation circuit is created between the bypas itself and the pump. A ball valve or a check valve must be installed in the bypass for such a scheme to operate properly.

Baypas installation: DIY installation subtleties

Generally speaking, the jumper bypass has a fairly straightforward design that even someone with no plumbing experience can assemble. I’ll say it again: understanding the basic principles of this device’s operation is crucial. With this knowledge, creating a bypass on your own for a circulation pump or another purpose is not that tough. Think about this procedure a little more.

  1. What we have? For example, a heating highway on which a circulation pump is mounted. The first thing to do for installing bypas is to remove it and redo the highway a little – in particular, you will need to slightly increase the distance between the threaded ends to which the pump was wound. It is best to determine this distance in place – in the sense, assemble a pump and a knot around it as it should be.
  2. To do this, immediately behind the pump, on one side and on the other side, we wind up ball valves – this can be done right away. We have detachable joints on the pump, so quickly disassemble the knot and mount it on the pipeline will not be.
  3. Following the taps (also on both sides of the counter), tees are installed exactly the same diameter as the pipeline itself. A reservation should be made here – the type of tee depends on the pipeline itself. In most cases, tees made of the same material are used as pipes – if polypropylene or metal -plastics, then the threaded ends are screwed into the taps and then tees are soldered or fastened to them.
  4. In principle, everything, the size is set, and now try on the assembled node in the place, cut the pipeline in the marked marks and insert the assembled knot. For convenience in work, it can be disassembled by Americans – simply put, remove the pump, after which you will have two parts of pipelines, which will need to be connected to the highway. After this bypass section is assembled, the pump is installed in place (capital) – only after that it will be possible to focus on the most circuit pipe.
  5. Everything is also easy here – to start from the tees, we raise the pipeline so that it does not interfere with the pump. Then we reduce the two pipe, coming from two tees, with each other – at least we set them the right direction to each other. And then there is a jumper and a crane, for the installation of which, again, a detachable connection and a pair of threaded tip will be required.

This is, in theory, the entire bypass for the circulation pump; other plumbing devices also have bypass mounted on the same principle. The bypass pipe can now be arranged both vertically and horizontally; neither way will affect its intended function or the caliber of the job.

That’s it. You now understand the purpose and operation of the bypass. Furthermore, the meticulous and careful reader will now have no trouble creating this node on their own without the assistance of trained experts. I won’t be afraid to say it again: gathering the bypass with your own hands won’t be difficult if you comprehend the basic idea behind how it works and are familiar with the gadget and each element’s function.

Author of this article: Alexander Kulikov

4 Features of installation

Certain features are present when installing different kinds of bypasses in the heating system. When the heating batteries are connected:

  • It is forbidden to install a faucet crane in multi -storey buildings;
  • The jumper must be put as close as possible to the battery;
  • The section of the bypass pipe is selected by a size of less than the pipeline of the main line.

Both when setting up a new heating system and when updating an existing one, bypass on batteries can be installed. To accomplish this, set up the necessary cross section of pipes, two tees, and shut-off valves.

One of the following equipment options can be installed on the incoming pipe:

  • The combination of an automatic thermostat and ball crane – the volume of a liquid that is suitable for batteries is adjusted automatically;
  • valve – installed for manual adjustment of the amount of coolant;
  • ball crane – does not create hydraulic resistance and makes it possible to completely pass the passing volume of fluid.

On an outgoing pipe is mounted a shut-off or ball valve. Each component is joined to the others via thread or welding. After installation, make sure all connections are tight, test the system, and make sure there are no leaks.

Generally speaking, the bypass is a portion of the main highway during the pump connection. It is not allowed to narrow its internal section because it guarantees water passage in a natural manner.

Purchasing an already-built pump unit with the necessary configuration is the most convenient option for installation. This will enable you to set up every component correctly and guarantee the joints’ dependability.

A relatively simple engineering device called a bypass allows one to achieve the required thermal regime in a home or apartment and increase the efficiency of a heating system. There won’t be any big issues if certain sections of the main highway malfunction or the electricity is cut off. The rooms will be heated continuously by the circulation of hot water.

Bypas device

A check valve or other similar component is frequently added to the pipeline’s main section in conjunction with the use of bypass for the installation of an additional pressure node.

The device is compact, with a two-part case. Within the bypass body is a ball or spring-loaded partition. The valve’s primary function is to maintain the heating system’s functionality when the pump isn’t producing extra pressure. The heating system’s valve operates automatically; human involvement is not necessary. This is very useful for emergency pump shutdowns when the home’s occupants are not present.

The check valve works on the following principle. The inclusion of a high-quality pump generates extra pressure at the valve’s output, locking it and preventing the liquid from moving (lower portion of the figure).

The absence of extra system pressure during an emergency pump shutdown (upper portion of the figure) "unlocks" the back of the bypas and opens the main pipeline to the flow of heated coolant. In this instance, the device just uses the laws of physics to operate, regardless of the operator’s presence. By doing this, you can prevent damage to the house’s entire heating system.

The so-called "American nut" was one of the fasteners that emerged and became widely used in recent years when installing components of heating systems.

It is a pair of details that are both stolen from and adorned with carvings. produced in both direct and corner variants. A specific system element is fastened by screwing one half of the nut onto the installed device’s threaded portion and driving the mobile portion of the connection into a pipe with a threaded fitting. By using these details, we can easily repair specific components in the bypass as well as any other area of the heating system. The primary benefit of the "American" connection is that installed devices, such as radiators and pumps, can be removed without having to disassemble the entire system.

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Where the bypass is used

Even in the event that one of the system’s components fails or the electricity is turned off, Bypass must keep the entire system operational. After the heat carrier travels around the roundabout, it is simple to disconnect all of the units that are connected using the device from the base by simply closing two taps.

On the strapping of radiators

In single-pipe heating structures, the jumper is the only device needed for radiators; in two-pipe configurations, all units will be connected in parallel to each other. The coolant will cool as it gets closer to each device because one-pipe wiring necessitates a sequential connection; the distant devices will experience the least amount of heat. A bypass helps to solve this issue by allowing the coolant to enter the radiator directly and assisting in the independence of streaming traffic.

On the circulation pump

Bypass improves the circulation pump’s efficiency.

Only in structures with natural circulation is the circulation type pump connected using the device; in this case, it is only necessary to improve performance efficiency. This is a good choice for systems that have an accelerated type collector installed and pipes that meet the required diameter and slope. Installation of a bypass is not necessary for forced circulation systems.

For a warm floor

They always install a mixing unit with a bypass bypass pipeline in warm floors of any kind. The jumper is a crucial component that the system cannot operate without in order for a warm floor to operate without interruption. A specific temperature must always be maintained in heated coatings, and the bypass is in charge of adjusting and raising that temperature to the necessary level.

The need for bypass for the circulation pump

Even in situations where there is natural circulation, the circulation pump can enhance the heating system. Its installation requires you to go around. The circulation pump makes the heating system more energy-dependent even though it improves efficiency.

Why a circulation pump device is necessary

  • Heating performance setting;
  • Disconnection from the working circuit of the pump;
  • Repair of the circulation unit without disconnecting from autonomous heating;
  • Coaling mode prevention

The natural circulation of hot flows is disrupted when the power is turned off. Bypass takes care of this issue. The fluid in the circuit moves physically when it overlaps the jumper. Coolant is delivered to the heating elements by the rising water that follows the contour in a natural stream. The cooling process descends and moves away from the boiler.

Installing the bypass valve is required to set the circulation pump’s performance.

Bypass will assist in fully eliminating this issue. Contemporary BYPASS models come with an automated valve. These kinds of designs are essential for any system that uses a turbo pump. It opens up when water is injected, allowing the coolant to flow freely along the contour.

A bypass is an essential part of a heating system that helps control the hot water flow and ensures effective heating throughout the house. Maintaining the balance and efficiency of your heating system depends on installing a bypass correctly and on your own. In order to keep your house warm and comfortable throughout the winter, we’ll go over what a bypass is, why it’s crucial, and how to install one correctly in this article. Knowing the ins and outs of bypass installation can help you save money on energy bills and avert future heating issues, whether you’re a do-it-yourself enthusiast or hiring a professional.

What is the bypass in the heating system of a private house and residential complexes

A bypass is required in the two-pipe system in order to send a heating source to additional radiators. You can control a private home’s microclimate by using a jumper to leave the appropriate amount of heat in the designated rooms.

Bypas can be used to regulate a private home’s microclimate.

  1. When the electric pump is disconnected, heating will stop.
  2. Bypass can save a difficult situation.
  3. Blocked the pump crane and starting the coolant through the jumper, you can activate natural circulation without stopping the heating system.

All you have to do is block the jumper taps in case there is an emergency leak in the radiator. Water will be able to avoid the system, and replacing the contour element will be easy to disassemble. Weather-related surprises occur frequently. The pipeline provides an excessive amount of heat in the fall and spring. In this instance, you can adjust the room’s comfort level by blocking the node and preventing hot water from reaching the radiators.

Baypas installation

Prior to creating a backpass for heating, you must comprehend these situations because the incorporation of bypas in various system types has unique characteristics.

For instance, the following guidelines need to be followed when connecting radiators via the bypass:

  • The internal section of the contour should be one step less than the diameter of the main pipe;
  • You need to install the bypass at a minimum distance from the radiator;
  • When used in apartment buildings, bypass cannot be equipped with a crane.

When setting up a new system or fixing an old one, the heating system installation can be done simultaneously. In the latter scenario, you must set up a set of nozzles with an appropriate diameter, two tees, and locking reinforcement before beginning work.

One of the following devices is installed in the structure’s input pipe:

  • Ball valve, which has a minimum hydraulic resistance and completely passes the flow of the coolant;
  • Valve, which allows you to configure the intensity of fluid current manually;
  • A combination of ball crane and an automatic thermostat – this combination can configure the operation of the system automatically.

A ball or shut-off crane is always attached to the output pipe. Individual elements can be joined together using thread or welding. Whatever the kind of connection, it needs to be sealed off. You must verify that the system is tight before turning it on.

When installing a bypass with a pump in the heating system, the following considerations are made:

  1. The bypass, on which the pump is planned, is usually part of the highway. The internal bypass diameter should be large enough so that normal natural circulation is ensured in the system. The pump is mounted on a separate pipe, the internal section of which can be less than the diameter of the main pipeline.
  2. To simplify your job, it is best to buy a collected pump unit with the necessary parameters in advance in advance. It is very simple to install such a design, since all the elements are already collected on it, and the connections are quite reliable.
  3. With independent installation, the pump should be located so that the axis of the impeller is horizontal. The surface with terminals to which the power is brought should be directed up-firstly, this will simplify access to the contacts, and secondly, it will eliminate the likelihood of liquid to contacts in case of violation of the tightness of the system.
  4. The bypass area is necessarily equipped with a check valve or ball valve, which prevent the coolant current in the opposite direction – this optimizes the operation of the system. Of course, before installing the bypass, you need to purchase all components.

Installing a backpass with a check valve for a circulating pump requires careful thought out system design, accounting for all potential subtleties.

Principle of operation

The pipeline’s moving coolant, water, and gas medium exert pressure on the damper that the spring holds. The shutter opens and the excessive volume of the working environment is assigned by a special branch in another circuit circuit as soon as the pressure force reaches a certain level.

The spiral sets the shutter to its initial position and allows the pipeline’s contents to flow once the level drops to a normal level.

The lever of the activator will control the damper in the car’s turbine, allowing it to fully open or close. A number of factors can cause variations in the length of its traction over time. As a result, this is being watched over and modified.

Baypas installation

Once you understand the operation of the heating system bypass and its necessity, you can refer to specific instances. Most frequently, multi-story buildings with single-pipe systems contain all of it. Aside from this, though, it is widely utilized in independent private home systems. To ensure proper installation, the hepatus bypass must be calculated and the appropriate components selected.

Bypass in a radiator strapping

In the heating radiator, bypass

Radiator strapping incorporates a bypass channel that is organized using both single- and two-pipe schemes. With it, you can change the coolant flow and carry out maintenance and repairs without turning off the boiler or unplugging the central heating system.

How can I create my own heating system bypass? First, it’s important to perform preliminary calculations and choose the right components. It is advised to use pipes made of the same material as the highway as a whole. There will only be one area of difference. The heating system’s required bypass diameter should be one size smaller than the main pipe’s cross section.

You should familiarize yourself with the following guidelines prior to self-installation.:

To provide locking (cutting off) reinforcement, ball valves must be installed. You can quickly reroute the coolant to the bypass with their assistance; It makes no sense to install the mixing valve. In collector systems, where the coolant flow rate is first normalized, it efficiently blends hot and cold water. In the case of pipelines and, more significantly, central heating, this is not feasible; In a single-pipe heating system, the bipas arrangement is required.

It’s critical to arrange the installation with the management company in advance.

Bypas installation plan

For the installation of a parallel pipeline, consumables are purchased. Consider by the example of a metal -plastic line the optimal set of components. Why is the bypass necessary in the heating system in this case? It will perform the function of a bypass for repair or replacement of the radiator, as well as to regulate the flow of water in the battery section. First, the distance between the straight and reverse pipe of the radiator is measured. Before making a bypass into the heating system, a pipe is cut off according to the obtained sizes. The most common pipe size in autonomous heating is ½. Based on this, components will be selected, the characteristics and cost of which are presented in the table.

Name Price, rub. Top Sum
Metal -plastic pipe, m.P. 23 0.5 m 12
Tee 75 2 pcs. 150
Exterior 50 2 pcs. 100
Regulating valve 448 1 PC. 448
Ball crane 137 2 pcs. 274
Total 984

Prior to the bypass being installed in the heating system, you should confirm that each connection is reliable. This can be accomplished by crimping this pipeline segment, ideally using a hydraulic technique. Coolant should only then be poured into the pipes.

Bypass for installing a circulation pump

Pumping heating node types

In contrast to radiator strapping, the goal of the bypas in a forced-type heating system is to reduce hydraulic losses. For this, the pump is mounted directly on the bypass rather than on the return pipe.

In this instance, what does a heating system bypass mean? He carries out the same tasks as when he straps the radiator. The addition of a check valve to the pipe makes it unique. Preventing a shift in the coolant’s direction during power output is essential.

Additionally, you must consider the following features when installing:

  • The bypass is needed without fail in the autonomous heating system with forced circulation. Without it, when the electricity is turned off, the speed of the coolant will sharply decrease;
  • The optimal bypass diameter in the heating system for the pumping of the pump is 2 sizes smaller than the cross -section of the main pipe;
  • A mesh filter is installed in front of the pump to prevent garbage entering its mechanism.

How to install a system

It is best to install bypasses in addition to heating systems at the same time. Occasionally, an existing heating system needs to have one of these devices installed. In the latter case, warm seasons are the most desirable time to install because the heating system is not used during that time. It should be kept in mind that the liquid needs to be drained before beginning any installation work from the pipeline.

It should be mentioned that the materials used to make the pipeline and the heating contour itself have a direct impact on the work itself and how difficult they are to implement. Working with metal and plastic will be the easiest. And welding equipment is needed for metal or polypropylene. That is to say, trying to install it yourself won’t work; you need the assistance of experts.

When installing independently, keep in mind that the bypass track, which is installed parallel to the return track, receives priority attention.

It’s crucial to remember to turn off the faucets. Additionally, you must exercise caution around the pipe’s edges; it is best to avoid confusing them.

Additionally, you must exercise caution around the pipe’s edges; it is best to avoid confusing them.

Therefore, it is best to not overlook installing bypass since it is a significant and practical device that can assist in a variety of situations.

Installing a bypass in your home’s heating system is a wise choice if you’re thinking about upgrading. It’s a straightforward upgrade that can greatly increase your heating system’s effectiveness and efficiency.

Proper water flow and pressure are ensured by a bypass in the heating system, which guards against problems like noisy pipes, uneven heating, and possible boiler damage. A bypass lessens wear and tear on your heating equipment by enabling water to pass through the boiler when it’s not needed.

Many homeowners can do the installation of a bypass in their heating system themselves, but it’s important to do it right. Make sure you carefully follow the manufacturer’s instructions, and if you’re unsure, think about consulting a professional. With the correct equipment and a little knowledge, you can increase the effectiveness of your heating system and take pleasure in a cozier, more pleasant house.

Video on the topic

Circular pump with bypass

Installation of bypas and cranes on 2 cast-iron radiators, in central heating in the apartment.

Bikes assembly and installation with a pump into a heating system

Obvodnoye pump for heating! Bypass!

Proper heating of the circulation pump in the bypass

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