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Orugbo Studio · Example tool, indicative figures

What size heat pump does this house need?

A working example of what we build for heat pump installers. It gives a homeowner an indicative size and cost in about a minute, and sends you the answers. It is not an MCS heat loss calculation and the page says so twice; the room by room survey to BS EN 12831 still follows.

The house

Sized against -2 C, the winter design temperature there

A mid terrace loses heat through two walls, a detached one through four

Cavity walls, little or no insulation

All storeys

For hot water

What has already been done

Each of these lowers the heat loss, and so the size of pump and the cost.

Heating now

Used to work out the saving

Existing radiators mean a hotter flow, around 55 C, which costs more to run.

What this house needs

Heat loss
5.3 kW
Heat pump
6 kW
Flow temperature
55 C
Seasonal efficiency
2.9 to 1
Running cost a year
£982
You pay now
£794
Difference a year
£188 more

Mains gas is cheap per unit, so a heat pump on existing radiators does not always save money straight away. Lowering the flow temperature is what changes that, and it is worth asking about.

What it costs

Installed
£8,000 to £11,000
Boiler Upgrade Scheme grant
less £7,500
You pay
£500 to £3,500

The grant applies in England and Wales and the work must be done by an MCS certified installer.

Where the heat goes

Walls
66 m2
2,284 W
Windows and doors
15 m2
468 W
Roof
24 m2
87 W
Ground floor
24 m2
183 W
Air changes
238 m3 of rooms
1,803 W

This is an estimate, not a survey. A heat pump cannot be installed on it. Every MCS installation needs a room by room heat loss calculation to BS EN 12831, measured at the property. What this does is tell you roughly where you stand before you book one.

Email this estimate to Orugbo StudioOr send it on WhatsApp

Opens with the whole estimate already written out.

What this tells you

A heat pump quote normally starts with a home visit. This gives you a rough idea before you book one: how much heat the house loses on a cold day, the size of pump that points to, what it might cost to run against what you pay now, and what is left to pay after the grant.

It does not replace the survey. Every MCS installation needs a room by room heat loss calculation measured at the property, and that figure can come out higher or lower than this one.

Have these to hand

  • The floor area across all storeys. An Energy Performance Certificate will show it.
  • The year the house was built. A good guess is fine.
  • What has been insulated already, from the walls and loft to the glazing.
  • What heats the house today, and whether you are on the mains gas grid.

Reading the result

Look at the heat loss first, because the pump size follows it. Tick the insulation boxes one at a time and watch how far the numbers move. Where the heat goes shows which part of the house is losing the most.

Then try the radiator switch. Existing radiators usually mean a hotter flow, and a hotter flow costs more to run.

The running cost can come out higher than mains gas, and the tool will say so when it does. Homes on oil, LPG or electric heating often compare better.

Questions people ask

How much is the Boiler Upgrade Scheme grant?

£7,500 towards an air source or ground source heat pump. Homes heated by oil or LPG with no mains gas connection can get an extra £1,500 until 31 March 2027. Your MCS certified installer applies for it on your behalf.

Does the grant apply in Scotland or Northern Ireland?

No. The scheme covers England and Wales, so ignore the figure after the grant if you live elsewhere. Scotland has its own support through Home Energy Scotland. The size and running cost still apply.

Why can it not size a pump from floor area alone?

Two houses of the same size can lose very different amounts of heat. A detached house loses heat through four walls and a mid terrace through two, and an older house with no wall insulation loses far more than a newer one.

Is this a quote?

No. It is an estimate from typical figures, not any installer’s price. A real quote follows a survey of your house.

In Ireland? Use the version with the SEAI grant →

Want this on your own website?

This is the real thing, not a mockup. We build these for heat pump installers and put your own rates inside, so the number a visitor sees is one you would stand behind. It embeds in the site you already have with one line of code, or sits on a subdomain with a single DNS record. We never need access to your hosting.

Fixed price, fixed date, agreed in writing before anything starts. Tell us what people ask you before they buy and we will say honestly whether this is worth doing for you.

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