Autonomous heating in the apartment with your own hands

Are you sick of spending a fortune on conventional heating systems that only make you feel cold on chilly winter nights? It could be the perfect opportunity to take control of the situation and learn more about your apartment’s autonomous heating system. You can turn your living area into a comfortable haven while saving money and lessening your environmental impact if you have a little do-it-yourself spirit and know-how.

For individuals who want more control over the temperature and energy use in their home, autonomous heating presents a workable option. You can overcome the limitations of traditional heating techniques by utilizing alternative heating sources like solar energy, biomass, or even recycled materials. Regardless of your experience level with do-it-yourself projects or your level of experience as a homeowner, there are solutions to fit every need and budget.

Customization is one of the main advantages of autonomous heating. In contrast to pre-made heating systems that provide little customization options, do-it-yourself solutions enable you to create a heating configuration that is uniquely suited to the layout of your apartment and your individual tastes. When you take control of your home’s heating system, the options are endless, ranging from ductless mini-split systems to radiant floor heating.

Starting an autonomous heating journey might seem intimidating at first, but don’t worry—there are plenty of tools and resources available to help you along the way. Online discussion boards, do-it-yourself guides, and neighborhood workshops offer priceless advice and support, giving you the know-how and self-assurance to take on your heating project head-on. You can quickly experience the coziness and warmth of a self-sufficient heating system with a little perseverance and research.

Heating system

A wall-mounted boiler that powers the apartment’s heating system

Apartments can have quite different heating systems for autonomy, but when it comes to water contours, there are three primary options to think about: "Warm Paul," two-pipe, and one-pipe heating systems. It is also possible to choose a combined option, which yields excellent results. However, we will focus on radiators, which are like family and well-known to all post-Soviet individuals.

Two -pipe and one -pipe systems

Two pipes in the apartment’s heating system

• The most reliable, perhaps, is a two -pipe apartment heating system. Because with such wiring, at least heat loss. Here the coolant, in this case, water, from the supply pipe enters the radiator, but returns from it already to the return pipe or “return”. Pipes can be placed differently-they can pass two together, under the batteries, by the floor or the supply is mounted on top of heating devices.

Wiring scheme for a single-pipe heater

• The situation with a one -pipe heating system is somewhat different. because in this case, the water, entering from the pipe into the radiator, again returns to the same pipe, but already slightly chilled. It turns out that the further the heating device from the beginning, the colder it will be, because the coolant, reaching it, cools in other batteries. This design is good for two or three medium-sized batteries, in any case, you can allow up to five, but this will already be overgrown.

Apartment heating scheme: the radiator is number two, and the bypass is number one.

• Single -pipe heating schemes of the apartment can be with bypass, as shown in the upper figure, and can be without it, as can be seen in the lower image. The difference is that the jumper allows you to dismantle the radiator without stopping the circulation of the coolant – for this it is enough just to block the taps on the battery. But if the bypass is absent, then by removing the heating device, you tear the chain, which means that you interrupt the circulation (according to this scheme, water supply to heated towels in apartment buildings is often collected).

Radiator single-pipe connection without bypas

Advice: Installing a one-a-packed heating circuit in an apartment where all of the rooms are on the same line is pointless since the pipe has to be turned back to the boiler. Use of a two-pipe connection is preferable because the material consumption will remain the same.

Installation of heating scheme

Complete apartment heating system

1. Pipe made of metal -plastic or propylene;
2. Ball valves;
3. Direct radiator tap;
4. Expande membrane tank for 18l;
5. Circulation pump in the kit;
6. Check Valve;
7. Security group;
8. Heating radiators;
9. Thermostatic valve;
10. Radiator angular or straight cranes (according to need);
11. Plug or footer;
12. Maevsky valves;
13. Ball valve for water descent;
14. Plug or footer;
15. Thermostatic heads.

Advice: the pipes’ diameters are shown in the diagram, but you can use eco-plastic polypropylene for the feed and return. The thirty-second pipe (external D-32 mm) can handle the feed and return, and the radiator bends make up the twentieth pipe. Polypropylene taps are also preferable to metal ones since they practically never boil and require less operating resources.

Autonomous heating radiators

Elegant aluminum radiator

• Until recently, as the instruction required, you probably had cast -iron batteries that were connected to a centralized heating system. But for autonomy, such heating devices are not beneficial, at least for two reasons-firstly, they have too large a capacity and they need to heat a lot of water and, secondly, cast iron is not a very good heat conductor (therefore too thick) and therefore) and therefore) and therefore) and therefore too thick) Heating for a long time. As a result, you will receive gas reread and unreasonable money costs.
• The most suitable heating radiators for the apartment are made of aluminum, steel and bimetalla. Any of them are suitable for low pressure, which a small water circuit has and all of them withstand high temperatures. If desired, you can also combine radiators and a water -free water system in one circuit.

Suggestions. Aluminum radiators are the most expensive and efficient of all the heating devices mentioned above, but they are also the most erratic. Because water contains a lot of alkalis, neutralizers must be added to the system. Additionally, since the interaction of these two non-ferrous metals causes their oxidation and destruction, copper cannot be allowed in the circuit.

The calculation of radiators

It is possible to decrease or increase the number of sections.

• To count the number of sections in the radiator required for a room with ceilings no higher than 3 meters, you can use the formula s*100/p. Here, s indicates the area of the room, and P – the nominal power of the section, which usually ranges from 180 to 200W. The number 100 displays the required amount of W/m 2. and the letter K We denote the original result.
• We take, for example, a standard room 3.5 × 6.5m = 22.75m 2. batteries with a power of one section of 185W and substitute values in the formula. We get k = s*100/p = 22.75*100/185 = 12.29, but there can be no fractional number of sections, therefore we round the number in the larger direction (in reserve) and get a heating device consisting of 13 sections.

Panel radiators with varying capacities and dimensions

• But what if you purchase panel heating radiators into the apartment, because they do not understand sections, but simply vary by power and size. In this situation, the formula is also used, but, of course, the other is p = v*41. The letter P will correspond to the initial power, V is the volume of the room, 41 – the amount of W/m 3. For calculations, we use a small bedroom 250 cm high and an area of 225*450 = 10.125m 2. So v = 2.5*10,125 = 25.3125m 3 .
• Now we calculate the power of the radiator, which we will have to install with our own hands in this very bedroom. So, p = v*41 = 25.3125*41 = 1037,81,25W. There are no heating devices with such power, therefore, depending on the climate of our region, we select the battery either for 1 kW or 1.5 kW.

Polypropylene welding

Using a soldering iron to warm up polypropylene

• The most effective heating of apartments is made of polypropylene pipes for heating. Moreover, it implies not only the heat transfer of radiators, but also the price of the contour and the speed of its installation. For wiring, as mentioned above, a pipe re -re -re -aluminum foil is used with a diameter of 32 mm and 20 mm.

The tee and pipe connect.

• Polypropylene heating occurs at a temperature of 280⁰C-300⁰C, with holding the pipe and fitting on hot nozzles for 5-6 seconds. Then the parts are removed and connected by each other by investing in each other, as in the photo above. After fixing, they are still held for 5-6 seconds.

Conclusion

It’s likely that you had to watch videos or observe firsthand while the heating system was installed. However, if you do it yourself, please try to follow the directions on this page as well as the gas boiler’s instructions.

DIY heating in the apartment: Masters" advice

People are increasingly choosing autonomous heating in apartment buildings instead of centralized heating systems in recent times. because it is far more successful and profitable. Using your hands, you can easily create heat in the apartment. Typically, gas convection boilers are used, and radiators are assigned from them. The image shows what such a heating system looks like.

Apartments can have different systems for their own heating, but there are three options for the water system: one-pipe and two-pipe wiring, and "warm floor." Additionally, there are combo options, which are also very successful. However, because they are the most recognizable, radiators are the most well-liked.

In the quest for warmth and efficiency in our homes, autonomous heating systems offer a DIY solution that puts control back into the hands of homeowners. Whether you"re seeking to cut costs, reduce reliance on centralized heating grids, or simply customize your comfort, installing autonomous heating in your apartment can be a rewarding project. By utilizing readily available technologies and materials, such as electric heaters, radiant floor heating systems, or even pellet stoves, individuals can tailor their heating setup to suit their needs and preferences. With proper research, planning, and adherence to safety guidelines, transforming your apartment into a cozy haven with autonomous heating is an achievable endeavor, empowering residents to take charge of their home"s warmth and energy efficiency.

Differences of one -pipe and two -pipe systems

Because there is little heat loss, the two-pipe heating system is thought to be the most dependable. This is the component of an apartment building’s heating system. Water acts as the coolant, and it travels from the supply pipe into the radiator and back to the "return". Pipes may be found beneath the batteries, at the floor, or in pairs. When the supply pipe is above the radiator, there is an additional choice.

One -pipe system looks different. In this case, the water entering the radiator returns to the same pipe, but it already has a smaller heating temperature (read also: “A single -pipe heating system of Leningradka: Features“). Thus, the farther from the beginning of the system there will be a battery, the less it begins to warm up, since while the coolant reaches it, it will have time to cool in other devices. A similar system is suitable for two or three medium -sized radiators, in extreme cases, this number can be increased to five, but the heating efficiency from this will decrease. A single -pipe heating device in an apartment building is practically not found, since in this situation it is absolutely ineffective.

One-pipe systems may or may not have a bypass (jumper). Simply block the taps in front of the battery to disassemble the radiator without stopping coolant circulation thanks to this jumper. In the event that there is no bypass, the water circulation stops and the circuit is ripped when the device is removed. This apartment heating plan states that in multi-story buildings, the heated towel rails are frequently supplied with coolant.

Installing a single-pipe heating system in an apartment that has all of its premises in a single line is not logical because the pipe needs to be turned back toward the boiler (see "Installing heating pipes in the apartment – the main types of material"). It makes sense to employ a two-pipe scheme in this situation. The picture shows you how the heating device diagrams appear.

You’ll need the following supplies to install the apartment’s heating system:

• a gas boiler;
• pipe from propylene or metal -plastic;
• radiator crane is straightforward;
• Ball valves;
• expansion membrane tank with a capacity of 18 liters;
• circulation pump;
• check valve;
• thermostatic valve;
• security group;
• Maevsky valves;
• radiators;
• footer or plugs;
• ball tap for water descent;
• Thermostatic heads.

The diameter of the feed and return pipes should be 32 millimeters if they are composed of polypropylene. Radiator dishasis can be up to 20 millimeters in diameter. It is advised by experts to use taps in addition to polypropylene pipes because they are more resilient than metal (see also "How to make pyrolysis boilers with your own hands").

Heating radiators and their calculation

In general, many people are aware of how an apartment building’s heating system operates. In apartments, cast-iron batteries are frequently seen linked to a centralized system. These radiators are not appropriate for the apartment’s autonomous heating system. You have to heat a lot of water because they have too many containers. In addition, cast iron takes a very long time to warm up. Consequently, there will be a gas overflow when using cast-iron batteries, which will result in significant expenses.

When making heating repair in the apartment, you should pay attention to radiators from other materials. Experts recommend installing modern steel batteries, aluminum or bimetalla (read: “How to install heating radiators in the apartment is a brief management“). All of them are suitable for low pressure in the heating system (this is characteristic of small water circuits), and also withstand high temperature. If necessary, you can even combine radiators and a “warm floor” system in one scheme.
As for how to improve heating in the apartment, it is recommended to install aluminum radiators. But they are quite complicated in operation (read: “Heating in the apartment: schemes and features of the project“). With an increased content of alkalis in water to the system, it is necessary to add neutralizers. It is also unacceptable to get into the contour of copper, since the interaction of this metal with aluminum leads to their oxidation, and, accordingly, destruction. In addition, aluminum radiators are not affordable for everyone.

Determine the required power and section count before purchasing radiators. This step requires extra attention if the question of how to generate heat in the apartment comes up.

If the ceiling height is less than three meters, you can use the CH100/P formula to determine the number of sections in the radiator. The letter S represents the room’s area, and the letter p stands for the section’s nominal power. The section’s power is typically 180–200 W. The appropriate value of W per square meter of area is 100. The letter K, for instance, indicates the outcome.

Using this formula, you can determine how many sections the radiator has. For instance, the room is 20 "squares" in size. The batteries have 185 watts of power. Thus, k = sh100/p = 20×100/185 = 10.81 is the outcome. However, since there cannot be a fractional number of sections, the resultant number is rounded upward. The radiator should actually have eleven sections as a result (see also: "How to calculate heating in the apartment – recommendations").

They use an alternative calculation formula if installing the apartment’s heating system yourself involves using panel radiators that aren’t segmented. You will need to figure out the batteries’ size and power in this situation. This is how the formula appears: p = vx41. The initial power is represented by the letter P, and the room’s volume is represented by v. The weight of water needed to heat one "square" of the area is 41.

For instance, you could use a room that is 15 "squares" in size and 2.7 meters high. Hence, 40.5 = 2.7×15 = v. It is now worthwhile to determine the radiator’s power. The formula that results is p = vx41 = 40.5×41 = 1660.5. It makes sense to select a radiator with 1.5 kW indicators because there aren’t any heating appliances with that much power.

Once the computations are finished, radiators can be purchased. The apartment’s heating wiring should be installed in accordance with a carefully thought-out plan.

Detailed video explaining how to make heating on your own:

Polypropylene welding

Experts recommend polypropylene pipework. Use 20 or 32 millimeter diameter reinforced aluminum foil pipes for wiring.

The pipe and fitting are placed on a hot nozzle for five to six seconds after the polypropylene is heated to a temperature of 280 to 300 degrees. After that, these components are taken out and joined together via investment. They are held for an additional five seconds after repairing.

The process of installing heating in an apartment is not difficult. All you have to do is carefully review and adhere to the heating system’s scheme.

Leave reviews:

How to conduct heating in the apartment with your own hands?

Today, central heating is a common feature in many city apartments. It so happens that the primary housing fund in our cities is included in the utility maintenance service. This mostly relates to the problems of making sure city apartments have heat during the heating season. There has always been much room for improvement in the quality of work performed by the centralized heat supply system for consumers. The current procedure’s ineffectiveness is the cause. Furthermore, as energy costs rise, more people are searching for cheaper ways to heat their homes.

Many apartment owners attempt to convert to heating their units on their own. The two main concerns that our citizens today have are what challenges you face in this situation and how to make heat with your hands. We’ll work together to find solutions to the problem and uncomfortable questions.

Want to have your own heating. The algorithm of actions

Obtaining a disconnection permit

The desire of residents to improve the heating of their own apartment in the cold period is natural, if we take into account how centralized heating in our homes works and which at the same time we have to bear the costs of a communal apartment. At first glance, everything is simple. There is money, take it and install a boiler at home and heat up how to please. But there is one substantial "but". In our country, the independence of citizens, even in terms of disposing of their property, has its own restrictions. We are forced to heat our own housing, using the services of utilities. Any attempt to change the order of life support of a city apartment is pushed into obstacles from the state.

Energy companies are monopolists in the heat supply market, and the state helps them in this, artificially limiting citizens" capabilities to switch to autonomous energy supply sources. The heating system in an apartment made by yourself is most often the result of the grueling struggle of residents with regulatory authorities. The whole problem is how to get a resolution to disconnect from the central heat supply. Existing technical standards do not allow their own without permission to get the right to autonomous heating of a city apartment even, despite the fact that the Civil Code of the Russian Federation does not have a direct ban on conducting such actions for homeowners and the right is assigned to the apartment at any time, to refuse the services of a centralized heat supply.

Crucial! The act of shutting down the components of a domestic heating system without authorization is considered an administrative offense and is punishable by law. The Code of the Russian Federation’s Article 7.21 on administrative violations provides residents with a clear understanding of their responsibility in this regard.

Assemble your apartment’s independent heating system by hand; this should start with just one. To turn off the central heating, you will need to obtain official permission on your own. At this point, you have to choose the best kind of home heating for your situation.

Note: To improve the safety of housing facilities’ operations, centralized gas supplies are not present in high-rise buildings (more than nine stories). As a result, the majority of people who live in the old building’s apartment buildings—which have a centralized supply of household gas—accept gas heating.

You choose whether to use gas or electricity for heating. What matters most is that the project would adhere to all applicable safety and construction regulations.

The project needs to include detailed hydraulic calculations, the plan and scheme for connecting the heating devices, and all necessary technical specifications. You can’t address the technical aspect of the problem directly until all bureaucratic problems have been resolved.

Dismantling of old heating

After settling with the energy provider and obtaining a disconnection permit, you can move on to the next phase, which involves disassembling the intra-house system’s radiators and pipelines inside the apartment. You need the assistance of a management company or ZhEK in this case. The process for severing the apartment’s connection to the house’s heat supply must be agreed upon with these services. After that, you can begin taking things apart.

During the work process, it is imperative to strictly follow the order, eliminating the specific nodes and components of the system that match the plan. If, on the other hand, you violate the rules regarding the heat supply to other apartments, you will be held legally responsible for the damage as well as financially responsible for the fine. Repair broken home communications on your own dime.

Work should be disassembled starting with the primary wiring components. It is preferable to replace the riser and cut a new steel pipe with the same diameter rather than using an old one in order to maintain integrity with the central heating contour, which is now meaningless for you. After cutting off the central heat supply, disassemble the outdated pipelines and unplug the heating apparatus. After removing it from the central heat source, disassemble and disconnect.

For informational purposes only! There is a requirement. Using outdated wiring and radiators with new heating systems is highly discouraged. When autonomous heating is operating, mismatching technical parameters or a significant clogging can cause technological disorders.

Review of the necessary equipment for the autonomous heating system

Gas or electricity. What"s better

The first step in installing a DIY heating system is project analysis. The technical documentation must be strictly followed when performing any task. Changing the way the apartment is heated while on the go, adding more radiators, and installing a boiler with a higher power than what the project calls for are all problematic.

Retreat: A heat engineer, who is in charge of the new gas equipment’s functionality, must be present when the completed heating system is being tested. You might not be allowed to provide an official conclusion on the commissioning of gas heating if there are glaring differences between the technical data specified in the project and the cash equipment.

Thus, it’s best to determine which type of heating—gas or electric—is better for you and which ones should be installed beforehand. The requirements listed below need to be considered:

• coordination of project documentation with an energy company providing gas or electricity;
• When equipping gas heating, it will be necessary to install a coaxial chimney to the street;
• In the case of electric heating, it will require the re -equipment of home wiring, the installation of a three -phase meter and automatic machines;
• apartments equipped with gas boilers need to install supply and exhaust ventilation;
• direct connection of the boiler to the pipeline, launching is carried out by an authorized person, representative of the gas distribution organization.

It is best to consult specialists for guidance on these and other matters. Examples of such guidance include how to install the boiler and start the entire heating system in compliance with established standards and how to connect the heating equipment correctly.

It is appropriate to keep in mind that choosing electric heating will not benefit you or result in significant savings. Using electricity to directly warm the apartment is a costly pleasure. The implementation of a multi-tariff counter is the only way to see a noticeable improvement in the economy. The set consumption limit is frequently enforced by limitations on the use of electric heating. Overspending on electricity will result in unanticipated costs for lighting and a breakdown in the temperature regime.

A gas boiler. What are the options?

Once you’ve determined that the apartment will have gas heating, you can move on to assessing the heating equipment market. In this case, you will need to consider not only heat losses but also the apartment’s small size, the number of occupants, and their individual household requirements.

When selecting a heating boiler model, the primary focus should be on wall-type models. These days, there is a good representation of such technology on the market. You always have the option of selecting an electric or gas boiler with the appropriate power. It is not advisable for you to hold onto the high-power models. You could get by with a 6–10 kW boiler in a city apartment. A rough calculation shows that, with medium heating characteristics in the walls, 10 m 2 of living space require 1 kW of thermal energy. You can add 10–15% to this estimate to account for heat loss.

Note: Due to the high efficiency of current models, the power of heating boilers is taken literally, without any allowances or coefficients.

The most effective way to achieve true independence from central heating and hot water supply is to purchase a double-circuit gas boiler. The answer to the question of how to manually heat an apartment using electricity is straightforward: wall heaters with heating elements.

Note: Additional equipment and control panel installation will be needed for the installation of electric boats with induction or electrode heaters.

Although you can install a heated floor in the apartment, a water floor would be a better choice in this situation rather than an electric one. Because a water warm floor can be connected to the main heating contour, this heating method is incredibly convenient.

Installation. Step -by -step guide to action

Pipes made of plastic and metal can both be wired.

Compared to dealing with steel pipes and shut-off valves, plastic heating is far simpler to make by hand.

The final option appears to be better because it requires no welding and can be completed swiftly and carefully. Pipes made of polypropylene are strong and resistant to internal corrosion. It is far simpler to make your own heating using plastic pipes than it is to use steel pipes.

When heating a small two-room apartment with a boiler that has a circulating pump, the best option will be a one-pipe heating system with no more than four to five radiators.

The diagram illustrates that connecting radiators diagonally is the best configuration for a single-pipe system. In this instance, the coolant will make complete contact with the batteries’ inner surface.

For apartments with a larger living area, you need to use a two -pipe system, and if you plan to connect a warm floor and a hot water supply system, then a double -circuit boiler will also be required. The efficiency of heating all radiators in the apartment with a two -pipe system is higher, compared with a single -circuit. With a two -pipe heating system in the apartment, the lower wiring is usually used and the corresponding type of connection of radiators is used. On the diagram, you can see how the location of the pipes in the apartment goes, how batteries are connected and how hot water supply is organized in the house. The circuit made of plastic pipes can easily be replaced or changed if necessary. Its configuration.

Crucial! The only pipes that are used in the installation of plastic heating systems are reinforced polypropylene ones. This type of material is not susceptible to significant linear expansion when exposed to high coolant temperatures, in contrast to conventional plastic pipes.

You can use aluminum foil or fiberglass to reinforce the pipe. This design allows reinforced polypropylene pipes to withstand temperatures between 70 and 90 degrees Celsius as well as high pressures of up to 25 atm. When exposed to high temperatures, pipes reinforced with fiberglars have a higher line of linear expansion and a propensity to bend. It is crucial that they focus more on making adjustments for temperature extensions as a result.

It is individually required to equip each radiator with a shut-off valve and thermal controllers, which will allow the room’s heating temperature to be adjusted, in order to guarantee the ability to disconnect each radiator.

Choose the type of radiator that is best for you first. Although cast iron radiators are more dependable, they are expensive and have a bulky construction. Bimetallic radiators are currently utilized in heating systems to the greatest extent. This material has excellent operational characteristics due to the combination of steel and aluminum. Aluminum has good heat transfer, while steel can tolerate high system pressure.

Bimetallic radiators have great popularity due to their low cost, high technological advancement, and simplicity of installation. Batteries are put in place using brackets that are set straight into the walls. The best location for the radiator installation in the apartment is underneath the window, exactly 10 to 12 centimeters from the windowsill and the floor. There should be a minimum of 5 cm between the radiator’s back wall and the paneled meadows.

Note: Avoid mounting heating radiators on walls that are next to those of other apartments. In this instance, you and your neighbors will be warm thanks to the connected radiator. The cost of heating your neighbors will come out of your own pocket.

You can select the type of connection that radiators have with pipes. Battery connections to the pipeline can be made in four different ways:

• diagonal or cross;
• one -sided;
• lower;
• one -pipe.

The plan displays each of the four connection options along with all the implications that follow.

Topic	Autonomous heating in the apartment with your own hands
Benefits	Cost-effective, greater control over heating, independence from utility companies

Setting up your apartment for autonomous heating is a brave step toward energy efficiency and self-sufficiency. By taking action, you can reduce energy consumption and the impact on the environment in addition to gaining control over your comfort.

We have looked at a number of autonomous heating topics in this article, including insulation methods and heating source selection. Gaining knowledge of these principles gives you the ability to make decisions that are appropriate for your needs and situation. Installing a solar heating system, pellet boiler, or wood-burning stove is just one of the many options available, all of which can be tailored to fit a variety of living spaces and budgets.

We’ve also discussed the significance of insulation in maximizing heating efficiency. These steps, which range from improving wall and roof insulation to sealing drafts, are an essential component of the solution that guarantee the heat produced stays in the living area. You can reduce energy waste and heating expenses while simultaneously improving comfort by putting appropriate insulation practices into place.

Nonetheless, it’s crucial to approach projects involving autonomous heating carefully and diligently. The do-it-yourself method is flexible and economical, but it also necessitates meticulous planning and adherence to safety guidelines. By following these procedures, which range from seeking professional advice to obtaining required permits, you can reduce risks and guarantee a positive result.

In summary, installing autonomous heating in your apartment is a worthwhile project with many advantages for the environment and for you personally. You can create a warm, comfortable living space while lessening your carbon footprint by combining the appropriate heating source with efficient insulation techniques and a careful attitude toward safety. Now get your hands dirty, assemble your equipment, and set out to transform your home’s heating system into one that is more independent and sustainable.

Video on the topic

Autonomous heating with your own hands. Economical boiler from a warm floor battery