How much heating output (kW) might your room or home need?
Answer a few simple questions. You do not need to know construction formulas or heat-transfer coefficients. This is currently an illustrative test model, not a standards-compliant calculation.
What would you like to calculate?
How large is the space?
How well is the space insulated?
What conditions should we assume?
Important notice
This calculator uses a simplified model and approximate construction values. The result is neither a professional nor a standards-compliant heat-loss calculation. Ground-contact floors use a very rough model, not the EN ISO 13370 method. Thermal bridges, air leakage, building shape and certain other factors are not calculated separately. Actual heat loss may differ considerably. To the extent permitted by law, the online store operator LĂbi Termo, LĂbi Elektro, accepts no liability for decisions based solely on this indicative result. This legal wording must be reviewed before publication.
Test version 1.1 â do not publish to customers before professional review.
I want to heat my home with a stove with a hot-water heat exchanger. How much output to the heating-water circuit (kW) might I need?
The stove heats the room where it stands directly and sends heat to other rooms through the central-heating water circuit. We will estimate the heating output those rooms need. You do not need to know the output of the radiators or underfloor heating.
How is heat distributed in your home?
Have you already calculated how much heat your house needs?
If not, the first calculator will help. Find the result for the whole house and the room where the stove will stand.
In the first calculator, select The whole house, then One room (the room with the stove). If both calculators are on the same page, the second can automatically use both results. Otherwise, you can enter them manually.
Open the heating output (kW) calculator â
Without these values we would only be guessing the heat-exchanger output. We do not want to do that.
What results did the first calculator give?
If you calculated these on this page, the values may be filled in automatically.
Don't know one of the values? Estimate required heating output (kW).
Which rooms do you want to heat via water?
Will the stove be the main heat source?
This calculation is indicative and depends on the accuracy of the entered heat-loss figures. Underfloor heating needs professionally designed water temperatures, control and safe separation or mixing of circuits. This calculation does not determine a suitable stove, required thermal storage tank, system connection or safety equipment. A stove with a water heat exchanger must form part of a professionally designed heating system. To the extent permitted by law, the operator LĂbi Termo, LĂbi Elektro, accepts no liability for decisions based solely on this indicative result. The legal wording requires review before publication.
What size thermal storage tank might I need?
A thermal storage tank holds excess heat from the stove in heating water for use later. We will estimate how much energy could be stored and what volume of water this approximately corresponds to.
What stove have you chosen?
How large an area is heated by water from the stove?
Open the first calculator, âWhat heating output (kW) might I need?â, to get an approximate value. Then return here. Without it, we would only be guessing the heat required.
How cold will it be outside when you use the stove?
How long will you heat continuously?
The calculation uses the entered indoor temperature (default 21 °C). In reality, both stove output and heat demand change throughout the day.
This is only an illustrative energy model assuming constant output and demand. The calculated volumes are not recommendations for actual thermal storage tank sizing, system design or confirmation of safe operation. A professional must design the system in accordance with the manufacturer's instructions. To the extent permitted by law, the operator LĂbi Termo, LĂbi Elektro, accepts no liability for decisions based solely on this indicative result. The legal wording requires review before publication.
How much heat can be stored?
How to interpret the result: Temperature differences of 20, 30 and 40 °C are only illustrative scenarios for usable water temperature changes in the tank. They do not specify safe operating temperatures for any particular system.