Energy Stack

04 · Heat

Heat pumps, the survey decides everything

Not a like-for-like boiler swap. The heat-loss survey, the radiator sizing and the flow temperature determine whether the install ends up comfortable and efficient.

Guides ↓ · Calculators ↓ · Articles ↓

Knowledge base

Guides on heat pumps

Reference pages on the kit, the install process and the questions worth asking before you book.

01

Heat loss survey

The single most important document
02

ASHP vs GSHP

When ground source justifies the cost
03

Radiator sizing

Why existing rads are usually too small
04

Flow temperature

The number that decides comfort and efficiency
05

Noise

What the figures mean and where to place the unit
06

BUS grant

Eligibility, application, accredited installers

Calculators

Numbers for heat pumps

Built for the questions that crop up while reading a quote. Each prints the working it does.

Heat pumps

Heat loss check

Back-of-envelope sanity check on a quoted survey figure.

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Heat pumps

SCOP estimator

Seasonal coefficient of performance for your design.

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Articles

Decision-led pieces

All articles →