Why Heat Loss Calculations Matter in Heating Design
- Andrew Fisher
- Jul 26
- 1 min read

When it comes to heating your home efficiently and comfortably, guesswork just doesn’t cut it. That’s why heat loss calculations are at the heart of every system we design.
What is a heat loss calculation? It’s a detailed measurement of how much heat each room in your home loses based on insulation, windows, floor area, and more.
Why it matters:
Prevents oversized or undersized boilers and radiators
Ensures every room warms evenly
Saves money by optimising flow temperatures and system performance
Without accurate heat loss:
Radiators may be the wrong size
Rooms can overheat or stay cold
You might waste energy (and money!) every day
At J6 Plumbing & Heating, every heat pump or boiler installation includes proper heat loss calculations. It's how we guarantee comfort, efficiency and long-term savings.







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