A heat pump is only as good as the temperature it runs at.

Everything people dislike about heat pumps — the bills, the radiator changes, the noise — comes out of one number: how hot the water has to be. Move that number and the whole argument changes. So this site lets you move it.

Free desktop check What it costs after the grant

An air source heat pump beside a brick house

The one relationship

Pick a house. Move the flow temperature. Watch the bill.

Illustrative · your figures come from the survey

01 — Your house

02 — Flow temperature

—Achievable in a 1930s semi after changing about 50% of the radiators.

Efficiency & running cost

1930s semi · 45 °C flow

Heat pump

£1,104

per year, at COP 3.3

Gas boiler

£1,120

same house, 85% efficient

−£16/yr cheaper than gas at this flow temperature.

Illustrative: 26.4p/kWh electricity, 6.9p/kWh gas, seasonal COP for a modern R290 monobloc at typical UK ambient. Your own numbers come from the heat loss survey, not from this page.

412

installs since 2019, all MCS certified

£7,500

grant, taken off your invoice

42 dB

at one metre — audible, and we say so

1 in 5

enquiries told to insulate first

What we will not do

Five ways to lose a heat pump sale honestly.

We will not install into an uninsulated solid-wall house without saying it first

A heat pump in a leaky house costs more to run than the gas boiler it replaced. We would rather lose the job than have you find that out in January. Insulate, then call us back — the quote will be smaller too.

We will not quote from a photograph

MCS requires a room-by-room heat loss calculation and so does physics. Anyone quoting off a postcode and a bedroom count is guessing, and the guess is always on the small side.

We will not fit a heat pump you cannot hear

You can hear it. It is roughly 42 dB at one metre — a fridge in a quiet kitchen — and it is audible at the boundary if the plot is small. We measure and we tell you before you sign.

We will not promise your bills will fall

Against a modern gas boiler at today's prices, a good install lands between a little cheaper and a little dearer, and the honest variable is your flow temperature. Against oil, LPG or old electric heating, it is a clear win.

We will not oversize the unit to be safe

An oversized heat pump cycles, wears and runs badly at part load. The calculation exists to be believed, including when it says 6 kW and the salesman down the road said 12.

Boiler Upgrade Scheme

£7,500 comes off the invoice, not off a form.

We claim it, it is deducted before you pay, and you never touch the paperwork. What you do need is a valid EPC with no outstanding loft or cavity recommendation on it — which is the sentence that catches most people out.

Boiler Upgrade Scheme£7,500 off, England & Wales

Who claims itWe do. It comes off your invoice, you never handle it

EligibilityYou own the property, it has a valid EPC, and there is no outstanding loft or cavity recommendation on it

What disqualifies youNew-builds, most social housing, and properties already on a heat network

ScotlandHome Energy Scotland grant + interest-free loan instead — different scheme, we do not cover it

Ten minutes on the phone before anyone books a survey.

About one enquiry in five gets told to insulate first and call us back next year. It is a bad sales tactic and a good heating system.

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