Is the bypass is needed in the heating system

The effectiveness of our heating systems is essential to maintaining a warm and comfortable home. One part of the heating system that frequently causes controversy among experts and homeowners alike is the bypass. This minor but important feature can make a big difference in how well your heating system works overall.

In essence, a heating system bypass offers a different path for water to flow through when certain radiators or zones are turned off. By allowing the water to continue flowing rather than forcing it through a closed loop, the bypass prevents pressure buildup and guarantees smooth system operation. It is still up for debate, though, whether a bypass is actually necessary.

Supporters contend that a bypass is necessary to keep the heating system’s pressure levels at ideal levels, particularly when thermostatic radiator valves (TRVs) are being used to regulate the temperature of each individual room. Without a bypass, the restricted flow brought on by closed valves can cause problems like uneven heating, noisy pipes, and even higher pressure that can harm the boiler.

However, some disagree, especially with regard to contemporary heating systems that have sophisticated controls and zoning capabilities, and they doubt the necessity of a bypass. They contend that well-designed and balanced systems might not even need a bypass because water flow can be efficiently controlled with other devices like electronic flow controllers or variable-speed pumps.

The choice to install a bypass in your heating system ultimately comes down to a number of considerations, such as the setup’s size and complexity, the kind of controls and valves that are used, and the degree of comfort and efficiency that you want. You can ascertain whether a bypass is required in your particular scenario by speaking with a licensed heating engineer or technician.

Scenario Is Bypass Needed?
New Installation Depends on system complexity and design
Existing System Upgrade May be necessary to regulate flow and pressure

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.

In the realm of heating systems, the debate over whether a bypass is necessary is a pivotal one. A bypass in a heating system serves as a shortcut for water to flow back to the boiler without going through the radiators. While some argue that bypasses are essential for maintaining proper pressure and flow, others contend that modern systems can function effectively without them. Ultimately, the need for a bypass depends on various factors such as the type of heating system, the design of the piping layout, and the specific requirements of the property. By carefully considering these factors, homeowners can make informed decisions about whether incorporating a bypass into their heating system is beneficial or unnecessary.

Automated circular pumps

The majority of the time, automatic adjusting circular pumps are mounted in the pump binding and supplied in the system where the heat carrier circulates gravitationally. Normally, the same heating systems would function independently; however, the pump increases the fluid’s velocity over the contour, minimizing heat loss and maximizing heat supply efficiency.

The automated circulation pump in the pump’s binding enables the system to configure itself so that human intervention is not necessary. When the device is not able to perform its function, the тепловой носитель begins to function, and the output at that moment is reduced. The circular pump opens when the pump stops, allowing liquid to flow through it, and the fixed pump impeller shuts off the heat carrier’s current.

Automatic circular pumps can be classified into two categories:

The first kind of device has a check valve built into its design. The liquid flows effortlessly on its own because the valve has very little hydraulic power. The heat carrier moves faster, toward the highway, and in two different directions when the pump is turned on.

The fluid moves on without any problems in the following stages, and the valve stops the return current. The valve itself operates on a very basic principle: when the hydraulic pressure at the exit side is greater than the pressure at the entrance, the ball is compressed tightly against the structure and is prevented from moving.

Circular valve pumps are incredibly easy to use and convenient, but their effect on the water quality is highly erratic when it comes to heating systems. The valve has to be replaced because it absorbs dirt too quickly and becomes unnecessary if the water mass contains various impurities, such as rust or scale.

In terms of functionality, injection circular pumps resemble hydraulic elevators. A pump unit is located in the central highway and is connected to a key contour by smaller diameter pipes. Both pipe segments are located in the center of the main pipeline using a similar layout.

Оогда насос запускается, часть жидкости заходит в отрезок трубы и пропускается зерез аппарат, неоднократно ускоряясь в процессе. Productive fluid pumping is made possible by the pipe’s output segment, which is visually reminiscent of a nozzle and doesn’t stop increasing in speed.

A vacuum forms over the course of the pipe segment, which causes the heat carrier to start to be drawn out of the circulation pump. The liquid is drawn along the main highway by the pressure-driven flow, which accelerates noticeably as it does so. Complete prevention of the possibility of reverse fluid current is made possible by this effect.

When the pump is turned on, the aforementioned process continues to function. The heat carrier passes through the circular pump completely when the pump equipment is turned off due to gravity.

Bypass in the system of strapping the heating boiler on solid fuel

The primary distinction between a gas boiler and a solid-fuel boiler is the inability to modify the high temperature at which heating materials (such as firewood, peat briquettes, pellets, and wood and stone coal) burn.

The interaction of hot air with a cold coolant causes an excessive temperature differential in solid fuel heating boilers, which quickly reach extremely high temperatures. This element adversely impacts the strength properties of material separation sources, causing them to wear more quickly. Steel is more susceptible to corrosion, and cast iron is more prone to cracking at these temperature swings. Furthermore, quick, high-temperature heating helps to create condensation on the chimney’s surface, which combines with sooty smoke.

The only technically acceptable and competent way out is to reduce the period of time of the interaction of hot air in a boiler with a cold coolant. To solve this problem, a small heating contour of a solid fuel boiler is created, in which a small amount of liquid circulates. Moving around the closed circle through a bypass jumper, the water quickly warms up, after which it gradually enters the main system through an opening thermostatic valve configured to a certain temperature. Hot water is mixed with the main coolant and gradually heats it, ensuring the smooth launch of the entire system without sharp temperature differences. This technique significantly extends the service life of all equipment, reduces the frequency of preventive work on cleaning chimney channels, increases the efficiency of the system.

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What is the principle of bypas itself

Indeed, this name sounds extremely strange to someone who speaks Russian. However, it is precisely in this term’s meaning that the element’s purpose is made explicit.

When we attempt to translate the word "bypass" from English, dictionaries provide a plethora of results that, in the end, simplify to one main idea: nouns "bypass", "bypass", verbs "bypass", "flow out", "choose a different direction" and similar terms. Therefore, it makes sense to believe that the purpose of this device is to provide an alternative movement rather than the ability to direct.

Thus, in reality, it is. When a plumbing system bypasses, a pipe section is called so that the path for a liquid (water for water pipelines, or coolant if heating is involved) is opened both through and around any device. When the bypass is kept open at all times and the fluid path is subject to the laws of hydraulics alone, this "shorted" stream may become uncontrollable. Control devices are frequently installed on the bypass. These can range from basic valves to automated devices that alter the passage section in response to changes in the surrounding environment.

One of the simplest and most prevalent types of bypass is a pipe-cross connecting the heating radiator to the eyeliners.

If we are solely discussing heating systems, then installing the bypass is possible:

  • In the strapping of radiators, which is more characteristic of single -pipe heating systems.
  • In the strapping of the circulation pump – in autonomous systems.
  • In the mixing nodes of water systems "warm floors".
  • To create a “small circulation circuit” in the binding of boilers (characteristic of units operating on solid fuel).

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The appointment of bypas

Any bypass’s primary purpose is to maintain the heating system’s operation in the event that one of its components breaks down or the electricity supply runs out. Without any issues, devices connected via bypass can be disconnected; to do this, simply block both taps, and the coolant will pass through the counter.

Thanks to the bypass, heating can function in any situation, and broken components can be fixed by devoting any amount of time to this. In the presence of bypass, the heating system’s dependability and ease of maintenance consistently improve.

The bypass is employed in autonomous heating contours to address the following issues:

  • Connection of heating devices to a single -pipe wiring;
  • Binding of pumping equipment;
  • Connection of a waterproof camshaft;
  • The formation of a small circulation circuit when using solid -fuel heating equipment.

Depending on the purpose of the bypass in a particular heating system, different installation techniques may be used.

Unregulated circular pump

The uncontrolled circular pump apparatus consists of a standard pipe without any equipment. There is no way to control the water current’s intensity because the pipe is always open and the liquid flows through it in an arbitrary manner. Devices for room heating are frequently connected via uncontrolled bypass pipes.

When planning a heating system, it’s important to remember that water always takes precedence in regions with the least amount of hydraulic resistance. This means that for a circular pump, the internal section of its vertical section’s diameter must be smaller than the internal section of the main pipeline. In the event that this requirement is not met, the heat carrier will inevitably move toward the circular pump.

Prior to incorporating the circular pump into the heating system, additional regulations must be considered during the horizontal heat supply design process. Because of its extremely low specific gravity, the heated thermal carrier constantly seeks to ascend.

The diameter of the component below the circulation pump should match the line’s diameter in order for the system to function properly if these regulations are followed. Additionally, the cross section of the pipe that leads to the heat exchanger should be smaller.

Specialist answers to questions

Most frequently, those who are not familiar with individual heating ask whether a two-pipe heating system next to the radiators needs a bypass. When it comes to single-pipe heating systems, a jumper is typically installed to guarantee the line’s functionality in the event of a shutdown or malfunction of any of the chain’s heat exchangers, as well as to ensure that the system’s uniform heating and necessity are undeniable. Such issues are unavoidable in two-pipe wiring since each circuit is connected independently of the others and coolant of the same temperature reaches every location.

The most basic jumper from the pipe segment in the heating line can accomplish numerous tasks with just one pipe wiring scheme. It supports the high maintainability of heating elements, the consistency of temperatures on all heat exchangers, and the continuous operation of the entire system. Additionally, the Baypass pipe is used in solid-fuel heating boiler strapping and warm floors, where it improves the equipment’s dependability and efficiency.

Baypas functions in the heating system

To be clear, the bypass is a pipeline intended to be used as a water duct to avoid a specific portion of the line where equipment is installed. It appears in two locations in heating schemes:

  • in single -pipe systems as a jumper on radiators;
  • on the camshaft of water warm floors.

As you are aware, heat transfer from the first battery in a single-pipe heating system influences the operation of the next, and so on. This holds true for schemes that are horizontal and vertical. The radiators will turn on in series if the heating system’s bypass installation is not made. Consequently, the first one will choose the highest temperature, the second will choose everything that’s left, and the third will only be defended by chilled coolant.

The feed and return near each battery are connected by a jumper whose job it is to direct some coolant away from the radiator in order to prevent this from happening. In this instance, the bypass principle aims to lessen the reliance between the nearby and distant heating devices by transferring a portion of the heat to each. The following figure illustrates how this is accomplished:

For batteries to receive consistent heat distribution and to be maintained or repaired, a bypass heating system is required. Simply cut off the two taps that are connected to the coolant’s input and output if you must disconnect and remove the heating device for any reason. After that, the water will pass through the jumper using the bypass route.

However, the purpose of the water floor collector’s bypass for heating is different. This circuit line has a three-way valve and is a component of the mixing unit. The node’s job is to heat the coolant to the proper temperature so that it can be supplied to the warm floors’ warming contours. As you can see, the water temperature in these contours stays below 45 °C, but it can reach as high as 80 °C in the supply line.

The three-way valve functions as usual, sending a limited amount of hot water from the system to a warm floor. The remaining coolant is recycled back to the boiler after passing through this automated bypass and combining with cold water from the collector. Due to the considerable temperature differential between the collector and the highway, the bypass line is always in use. It turns out that floor heating cannot operate normally without it.

Circular pump for the circulation pump in the heating system

The operation of the complex heating system with a forced circulation type relies on each of its constituent parts. One node that supplies heat for homes is referred to as a circular pump (supercharger). The circular pump for the circulation pump must be installed differently during installation; its simultaneous presence in the system is the result of multiple factors.

Why is the circular pump needed

The circular pump is essentially just a regular jumper that allows the heat carrier to pass freely through certain pieces of equipment. Speaking of the circular pump, this apparatus enables:

  • Remove the device from the heat -growing contour;
  • prevent an unmarried motor stroke;
  • do a fine setting of heat supply;
  • repair equipment or conduct warranty service unnecessarily.

The system with circulation supercharger’s primary advantages are its extremely fast water direction and its ability to partially ignore the working circuit’s resistance. Yet without electricity, such a plan is unable to function.

Additionally, the pump will increase the resistance to water current by forcing a switch to convective circulation. This might occur if he requires an immediate repair. In order to eliminate this resistance, a circular pump is required.

Additionally, when filling the heat carrier system or making a descent, a circular pump is required. In this instance, the supercharger could produce an air plug and obstruct the water path. The circular pump will eliminate the issue by supplying free fluid current.

Finally, he shares the load when establishing productivity, safeguarding the pump in the same way. Setting the system is rare, but having more insurance never hurts.

Assembly of the circulation pump

A crucial pipeline segment connecting the working circuit and the heating boiler is the circular pump. A ball valve is positioned at this direct current location, and when the supercharger is activated, it closes, stopping the heat carrier’s movement. A shut-off crane, whose typical location is beneath the operating system, is a less practical solution.

With the assistance of two bastards, the pump is positioned in parallel, sliced into the main pipe, and pointed in the direction of one another. It is essential to use quickly separate American-style fittings for fasteners, as this will enable quick disassembly if necessary. A reusable filter is positioned in front of the supercharger to block the liquid’s path, and cutting cranes exhaust this design on both sides. The pipes’ diameter must match the holes in the pump’s input and output.

The best course of action is frequently to buy a circular pump assembly that is already assembled. Designed to accommodate pumps with varying diameters, they come pre-installed with all the locking reinforcement and filter that are required. All that is required is the installation of the pump and construction of the required portion of the heating system. The distance between the connectors is the primary parameter. It is 110 mm for the most widely used kind of circular pumps.

The process of installing a circulation pump

Prior to installing a circulation supercharger, the proper location must be determined. The location should be chosen so that there is room for effective maintenance and disassembly of the node’s components. The positioning of all valves and cranes should also be taken into account; they need to be accessible.

The likelihood of overheating is decreased in a heating system with two pipes because the circular pump collides with the heat carrier’s reverse contour.

Depending on the material the pipes are made of, there are different ways to assemble the circulation pump.

  1. If plastic pipes, then the pump node is collected immediately, after which it is connected to the pipeline using sailed tees.
  2. If the pipes are iron, you should first attach the outlet segments of the pipe for the pump unit, and then put the valve of the circulation pump.

You should never permit the reinforcement outfit to become overheated from welding, as this will not affect its characteristics. For instance, the ball valve’s Teflon insert can take on different shapes. As a result, the welded joint location needs to be at least 20 centimeters away from taps and valves.

The working shaft of the pump needs to be positioned strictly horizontally. By doing this, the gravitational load on the shaft will be lessened and the pump’s lifespan will increase.

Bypass in the node of the circulation pump

To demonstrate that it is most likely not required for a private home’s autonomous heating system, which operates on the principle of forced coolant circulation. Even though the pump itself uses energy, the installation of the pump quickly pays for itself in terms of the best possible heat distribution in the rooms and operational efficiency. Even owners of systems that were originally intended for natural, gravitational circulation do not object to the additional installation of the pump unit at this time.

The issue, however, is that there are several places where there isn’t a power outage in the electrical supply. As a result, the heating system that is connected to the circulation pump starts to depend on energy randomly. It is advisable to consider an alternate source of electricity in this situation, such as a generator or a reliable power source. However, this will only be beneficial temporarily. Therefore, the heating system must be designed to be able to switch to operating on the principle of natural circulation in such dire circumstances. And the pump unit’s bypass is helpful in this regard.

Switching from forced to natural circulation is possible with pumping nodes with bypass, which operate differently in practice but exactly the same in principle.

Such a node can operate in manual mode, whereby the hosts just need to turn on and off the taps to reroute the coolant flow along the main pipe rather than through the bypass with the pump in the event of a power outage. Other assemblies employ valve devices, which automatically redirect the flow in those assemblies. An injector diagram is an additional choice that you have if you don’t need a crane or a valve. However, it isn’t highly recommended, so you should stick with the "classic."

We won’t stop at the pump node with bypass in this publication. Not at all, considering how unimportant this question is. On the other hand, a different publication is devoted to the issues involved in selecting and installing the circulation pump correctly, from the necessary calculations to the detailed instructions for self-installation.

It is clear from a thorough analysis of a heating system’s need for a bypass that adding one can greatly improve functionality and efficiency. A bypass is an essential part of maintaining equilibrium in the water flow through the system, especially when radiators or zones are turned off. A bypass keeps the pump from overworking and keeps the pressure constant throughout the system by allowing water to flow even when some areas are not in use.

In addition, a bypass makes sure the boiler runs in its ideal temperature range, which is critical to its longevity and functionality. In the absence of a bypass, the boiler may cycle frequently, resulting in needless wear and tear and possibly shortening its lifespan. Furthermore, the bypass’s steady water flow helps avoid problems like overheating and system imbalance, resulting in a more dependable and stable heating setup.

In the long run, installing a bypass can also result in cost savings and energy conservation. Through the maintenance of a balanced water flow, homeowners can avoid frequent repairs or adjustments caused by imbalances in the system, which can result in lower energy bills and maintenance costs. The increased efficiency that a bypass provides also results in a more comfortable living space with less temperature swings and even heating throughout the house.

Finally, even though installing a bypass in a heating system might involve more work up front, the advantages of doing so far outweigh the drawbacks. A bypass is essential to maintaining the best possible performance of a heating setup because it can increase comfort levels, energy savings, and system longevity. Thus, installing a bypass can be a wise investment for both homeowners and heating professionals looking to maximize the efficiency and general functioning of their heating systems.

Video on the topic

Connection of the heating radiator. Do you need a crane on a jumper (bypas) ? The reasons for the clogging of the battery.

Where to put it and where not.

Bypass without crane and valve.

Why do you need a bypass with a bypass valve in a combined heating system

Bypass for radiators


Bypass in the heating system (what is it, why is it needed + an example of an independent installation)

What type of heating you would like to have in your home?
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Michael Kuznetsov

I love to create beauty and comfort with my own hands. In my articles I share tips on warming the house and repairing with my own hands.

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