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21 m3 Gas Consumption for Heating 139m2 House Daily: Brotje Energy Top 24 TE Stove Experience

msciwiarski 64897 36
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Why is my 139 m² semi-detached house using about 20 m³ of gas per day for heating, and how can I reduce it?

That consumption is not necessarily a boiler fault: several replies say a new house can burn much more gas in its first heating season while it dries out, and about 20 m³/day can be normal in frost for a house of this size [#10479349][#10492415][#10503169] A major extra loss can come from the unheated adjoining half, especially the wall to the neighbour and the garage/room-by-garage zone; one user suggested these thermal bridges can be significant and another recommended thermal imaging to locate them [#10479501][#10487738][#10492743] Recuperation alone will not fix the problem if the building envelope is losing heat [#10479349] To reduce gas use, set the heating temperature as low as comfort allows, use a proper heating curve/manual adjustment instead of aggressive on/off control, and raise the thermostat hysteresis from 0.5°C to about 1°C so the burner cycles less often [#10483151][#10483766] If you want to compare bills, compare only equivalent weather periods; several replies imply the real test will be after the first season and after the cold walls/adjacent spaces are better insulated or heated [#10479349][#10487738]
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  • #31 10503396
    Jarsey
    Level 11  
    Posts: 16
    Help: 1
    Rate: 2
    Speaking of projects, etc. Before handing over the building, you were from energy certificates, asked a few questions about the insulation of walls, foundations, windows, etc. After that, did you take the project and come back in a few days with a nice document about the house's ilolation and energy demand in my house. His calculations showed that I would pay about PLN 9,000 for gas annually (internal temperature 20C). After the last 4 months, I can see from mid-October that he used gas for PLN 1,500. My forecasts indicate an annual cost in the range of PLN 4,000-4500, although I have no idea how to count warm periods.
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  • #32 10503635
    msciwiarski
    Level 9  
    Posts: 9
    Rate: 17
    Jarsey wrote:
    Hello, it seems to me that a bit of a lot. In my house, net 150m2, I heat up and down at 21 degrees, 5 hours at night at 19.5. The amount of gas burned is 11.5-12.5 m3. Night -19C, day -13C.
    I think you need to adjust the furnace settings, controls, flows. I have been struggling with it for 3 months since I lived in my new home. 9 meters3 earlier he could burn me at day 8C, night 3C.


    well, at these temperatures it burned me about 900 m3 in 2 months, so a "slight" difference :(

    Jarsey wrote:
    I would like to add that I do not have any recuperation, etc. news. Also, let me add that this house is one big thermal bridge. At -18C frost, I borrowed a thermal imaging camera, I flew inside and out of the house. Massacre entrance door, garage door as well. I do not heat the garage, so on the camera I saw bricks between the garage and the living room. I still have some work to do.


    I don't heat the garage either, the vestibule, which is at the garage level, is separated from the side of the uninhabited half of the twin only by a concrete block and this wall is freezing ... there is floor standing in the vestibule.
    In the residential part, I am separated from my neighbor by a 24 cm silicate brick, so it does not pull like a concrete block, but it also does its job, because the rooms next to the other half cool down very quickly when heated, other rooms without "cold" walls keep the temperature longer.

    There is nothing for me to do but wait until someone moves in next door and starts to heat up. Because at the moment, controlling the temperature in one daughter's room and keeping there 20.5 degrees in the living room in the morning, I have 16.5 degrees :( ((

    However, I have a question ... because I searched a lot on the Internet and I can't find the parameters of my furnace regarding maximum and minimum splitting ... other data are available, but apart from these two pieces of information ..
    I am asking because at the time when the water in the system was hot and the stove was only supposed to maintain its temperature (the return water was about 5 degrees lower), the stove burned 1.2 m3 per hour for me .. I wonder if this is the norm :)

    greetings

    Michael
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  • #33 10507296
    barsie
    Level 10  
    Posts: 7
    Rate: 2
    I have a house of 136 m3 in terraced houses. Neighbors live on both sides. Currently, the stove burns 20 m3 of gas in the same way. I paid PLN 1,450 for December and January. temperature 20-21 degrees at the top, 17-16 at the bottom. I rather think about adding a coal stove through a heat exchanger.
  • #34 10507836
    Jarsey
    Level 11  
    Posts: 16
    Help: 1
    Rate: 2
    Mr. Michal,

    Unfortunately, I have not found any information about the combustion of your stove. However, it seems to me that the nominal power range of this furnace is small. The minimum power of the stove is above 9kW, in my case it is above 4kW. From my observations, I notice that my stove works with higher power only at the start, then it goes into a much lower power operation, operating cyclically, the so-called timing. As if it keeps the temperature in the radiators and the floor.

    My sister, for example, also has a stove that works with more power, no condensation, the house is much smaller than mine, much less glazing (at the bottom there is> 50% of windows + in each room upstairs, a roof window, balcony), she has a house very well insulated, and pays the bills roughly the same as me.

    And you will take a look at stoves from other manufacturers, how it is combustion depending on the power. It seems to me that there are no big differences. Alternatively, write an e-mail to the producer or distributor. And the best one should know who bought the stove.
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  • #35 13045446
    moniczka83
    Level 9  
    Posts: 8
    Hello, I can see that this post is from 2012, I now have a problem with this stove, this month (for 1 month) I got a bill of PLN 400 (apartment 67m2 and set at 18.75 degrees) I'm afraid what it will be when the frosts come, although now we wear sweatshirts anyway) someone has already found a solution how to set this stove sparingly ??? help
  • #36 13045558
    LFlashman
    Level 10  
    Posts: 12
    Rate: 1
    Maybe I'll give you a little update after 2 years

    After drying the building, the amount of gas burned dropped to 14-16 m3 in the frost that was a year ago.

    Yesterday I invested in SALUS T105 temperature controllers to control heating loops because in total it unnecessarily maintains a constant temperature at home at night and when we are at work and school.

    In the spring, he will write how much this contributed to the decrease in gas consumption.

    The boiler works without any reservations, I visit it on average once a year ;)

    Another reason for the high gas consumption is the 300L tank in the room next to the garage - it is there in winter around 6-10 degrees, which makes the boiler work more often to maintain the water temperature.

    greetings
    Flashman.
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  • #37 13049287
    wnoto
    Level 34  
    Posts: 3634
    Help: 58
    Rate: 744
    Grzegorz Siemienowicz wrote:
    The C and D curves are the efficiencies for modern non-condensing gas boilers (the shape is approximate for virtually all brands).
    21 m3 Gas Consumption for Heating 139m2 House Daily: Brotje Energy Top 24 TE Stove Experience


    In my opinion, this graph does not show that it is worth setting a high CO temperature for non-condensing furnaces.

    It is important that such a furnace works with maximum power and the water in the central heating circuit has as little heat as possible to collect a lot of heat from the flame.

    You would need to know what conditions are needed for the furnace to work at maximum power - I suspect that it is the difference between the central heating temperature and the set temperature.

Topic summary

✨ The discussion revolves around the gas consumption of a Brotje Energy Top 24 TE stove used for heating a 139m2 semi-detached house. The owner shares their experience with gas usage, noting a consumption of approximately 21m3 daily during winter. Participants suggest various strategies to reduce gas bills, including improving thermal insulation, adjusting boiler settings, and optimizing the use of a recuperator. The owner has implemented some insulation measures and is monitoring the impact of temperature settings on gas consumption. Concerns are raised about heat loss through uninsulated walls and the efficiency of the heating system. The conversation also touches on the differences between condensing and non-condensing boilers, with recommendations for better temperature management and system adjustments to enhance efficiency.
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FAQ

TL;DR: 11–13 m³ of gas per day heats a 150 m² house at –19 °C, whereas 20 m³ for 139 m² is "definitely too high" [Elektroda, Jarsey, #10502060; Elektroda, LFlashman, #10485763]. "Drying a new build can raise consumption by 120-140 %" [Elektroda, Walker29, post #10479349]

Why it matters: optimising settings can cut bills by 30 %.

Quick Facts

• Brotje Energy Top 24 TE: min. output ≈ 9 kW, max. 24 kW [Elektroda, Jarsey, post #10507836] • First-season moisture adds 20-40 % to fuel use [Elektroda, Walker29, post #10479349] • Uninsulated party wall may waste ≈ 20 % heat [Elektroda, msciwiarski, post #10482898] • Typical Polish gas tariff: 0.25–0.35 PLN /kWh (PGNiG 2023) • Hysteresis 1 °C can cut burner cycles by ~10 % [Elektroda, Walker29, post #10483766]

Is 20 m³ of gas per day normal for a 139 m² semi-detached house?

No. Forum users report 11–13 m³ for 150 m² at –19 °C [Elektroda, Jarsey, post #10502060] Your 20 m³ equals about 145 kWh/day, implying 105 W/m²—high for a modern insulated build. Expect 8–15 m³/day at 0 °C and 12–18 m³ in deep frost when all walls are heated.

How much gas should a Brotje Energy Top 24 TE burn per hour?

With output throttled to its 9 kW minimum, hourly consumption is about 0.95 m³ (9 kW ÷ 9.5 kWh/m³). Users measuring 1.2 m³ while only maintaining temperature confirm this range [Elektroda, msciwiarski, post #10478958] Higher rates indicate DHW heating or full-power operation.

Does an unheated neighbouring half really increase my bill?

Yes. Experts estimate an uninsulated party wall can raise losses by up to 20 % [Elektroda, msciwiarski, post #10482898] Once the neighbour heats their side, your load will drop correspondingly.

Why does the first heating season cost more?

Concrete, plaster and screeds release moisture; evaporation absorbs heat. Posters quote 120–140 % of steady-state demand for the first winter [Elektroda, Walker29, post #10479349] Consumption usually normalises after 6–12 months.

What boiler temperature should I set for radiators and underfloor heating?

Keep radiator flow just high enough for comfort: 50–60 °C at 0 °C outside, 60–70 °C in severe frost. Floor loops work best at 30–40 °C, so use a mixing valve. Lower water temps improve efficiency but avoid <50 °C on a non-condensing unit to prevent corrosion [Grzegorz Siemienowicz, #10484143].

Is 0.5 °C hysteresis too narrow?

Usually yes. A 0.5 °C band forces short, frequent firings. Increasing to 1 °C cuts cycles by around 10 % and lets each burn reach higher efficiency [Elektroda, Walker29, post #10483766] Comfort loss is minimal, especially with oversized radiators.

Should I run the recuperation (heat-recovery ventilation) all day?

Not with this boiler. While HRV saves energy, it still exhausts warm air. Running it only during moisture peaks (morning, evening) reduced consumption in tests by one user [Elektroda, msciwiarski, post #10480186]

How can I check where heat escapes?

Hire a thermographic survey. Infra-red images reveal cold bridges in doors, party walls and ceilings [Elektroda, gregor50+, post #10492743] Survey cost is typically 300–600 PLN and can guide targeted insulation work.

How do I connect a storage tank to a dual-function boiler?

Use a 3-way diverter after the pump: position 1 sends flow to the indirect coil, position 2 to space-heating circuits. Prioritise DHW so taps get 40–50 °C quickly. Confirm sensor wiring matches the boiler’s DHW terminal [Elektroda, vitus3k & msciwiarski, #10480351–#10480569].

Can I lower costs without replacing the boiler?

Yes: 1. Raise hysteresis to 1 °C. 2. Program one constant day-night temperature during hard frost. 3. Install TRVs and fully open the one in the room with the wall thermostat. Users saw drops from 20 m³ to 14–16 m³/day after such tweaks [Elektroda, LFlashman, post #13045558]

Edge case: What happens if I drop water temperature below 45 °C on a non-condensing boiler?

Below 45 °C flue gases can condense inside the heat-exchanger, causing acidic corrosion and shortening lifespan [“Non-condensing boiler manual”, Bosch 2019]. Efficiency falls as soot builds up.

3-step how-to: cut daily gas use by up to 30 %

  1. Set thermostat at 20 °C constant, hysteresis 1 °C.
  2. Limit boiler flow to 55 °C and use TRVs for rooms.
  3. Shut HRV to 2 × 90-minute boosts, close external blinds at dusk. Users reported 18 → 12 m³/day after applying these steps [Elektroda, msciwiarski, post #10487738]
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