Heat Pump & Heating System Design

Get your heat pump
sized right, first time.

A proper heat loss calculation is the essential first step in any heat pump installation. We produce accurate room-by-room calculations that give installers the data they need to specify the right system for your home.

From £150 — fixed price, fast turnaround

MCS compliant Room-by-room analysis Air & ground source Radiator & underfloor heating

Why it matters

An undersized — or oversized — heat pump costs you more

Heat pumps work very differently from gas boilers. They run at lower flow temperatures and need to be accurately matched to the heat demand of your home. Get the size wrong and you’ll either struggle to heat the house properly, or waste energy running an oversized system that short-cycles and wears out faster.

A heat loss calculation, carried out to BS EN 12831, assesses your home room by room — taking into account the fabric, insulation levels, glazing, ventilation and floor area — to produce an accurate heat demand figure. That figure is what your installer needs to correctly specify the heat pump, emitters and controls.

It’s also a requirement for MCS-certified installations and often needed to access Boiler Upgrade Scheme (BUS) grants.

You need a heat loss calculation if…

Is this relevant to you?

You’re planning to install an air source heat pump
You’re planning to install a ground source heat pump
Your installer requires a BS EN 12831 heat loss report
You’re applying for the Boiler Upgrade Scheme (BUS)
You want to check whether your existing radiators are adequate
You’re designing a new underfloor heating system

What you get

A full heat loss report your installer can use

We produce the complete calculation your heat pump installer needs — no approximations, no rule-of-thumb sizing.

Room-by-room analysis

Every room assessed individually. Fabric, glazing, ventilation and exposure all factored in to produce accurate heat demand per room.

BS EN 12831 compliant

Calculated to the recognised British Standard. Accepted by MCS-certified installers and meets grant scheme requirements.

Emitter check included

We can check whether your existing radiators are suitable for lower flow temperatures, or advise on upgrades needed alongside the heat pump.

What we deliver

Your heat loss report includes

Room-by-room heat loss calculations (BS EN 12831)
Total property heat demand figure
Recommended heat pump output range
Emitter adequacy check (radiators / UFH)
Design flow temperature recommendation
Report in a format accepted by MCS installers

Worth knowing

Pair with an EPC for the full picture

If your property doesn’t have a current EPC, it’s worth doing both together. The EPC gives you a snapshot of your home’s current energy performance and highlights where fabric improvements would make the heat pump work more efficiently — before you spend money on the installation.

We can carry out both in a single visit and deliver both reports together.

View EPC service

Heat pumps installed at residential building

Sizing matters

The most common heat pump mistake — and how to avoid it

Oversized heat pumps short-cycle, wear out faster and waste energy. Undersized ones can’t keep up. A proper BS EN 12831 heat loss calculation takes about an hour and prevents years of underperformance.

Pricing

Straightforward fixed pricing

Pricing is based on property size. We quote upfront — no surprises.

Starting from

£150

For a 1-bed flat or similar small property.
Larger properties quoted individually — just get in touch.

Get a quote →

Get your heat pumpsized right, first time.