For installers and homeowners
One of the biggest reasons heating systems run too hot, are too expensive, and are too inefficient is simple:
The radiators are the wrong size.

If a radiator is too small, the boiler has to run at a higher flow temperature to heat the room
wasting energy, increasing bills, and reducing comfort.
The Mr Combi Heat Loss & Radiator Calculator App makes sure every room gets the right radiator, first time.

📲 Simple, fast and accurate
Just:
1. Enter the room volume (m³)
2. Select the target temperature (e.g. 22°C)
3. Tap Calculate
That’s it — no complicated forms, no guesswork.

🧮 Three powerful tools in one app
🔹 Heat Loss Calculator
Calculates how much heat a room actually needs.
🔹 Radiator Calculator
Tells you the correct radiator size and output to heat that room properly.
🔹 Watts ↔ BTU Converter
Instantly convert between Watts and BTU/h for any radiator.

🚀 Why it matters
Correct radiator sizing means:
* Lower boiler flow temperatures
* Better efficiency
* Faster warm-up
* Lower energy bills
* Happier customers

🔥 Download Now
Stop undersizing radiators and overworking boilers.
👉 Download the Mr Combi Heat Loss Calculator & Guide today and design heating systems that perform exactly as they should.