Heat Pump Electrical Considerations — London 2026

Air-source heat pumps (ASHP) are now mainstream in London thanks to the £7,500 Boiler Upgrade Scheme grant. But before you sign with an MCS installer, the electrical side needs sorting. Here’s what NICEIC electricians want you to know.

Electrical load of a typical 5-8kW ASHP

Most home ASHPs draw 6-12A at full pull (1.4-2.8kW electrical input for 5-8kW heat output). That’s about the same as a kettle continuously. Your existing supply almost always handles it.

What gets fitted electrically

Cost (electrical side only)

£450-750 typical for a London install — IF your consumer unit has a spare way. If full, add £450-650 for a board upgrade.

Pre-survey questions to ask

Where will the outdoor unit sit? How far from your fuse board? Single-phase or 3-phase supply? Is your earthing adequate (TN-C-S vs TT)?

Call 07407 627542 for the electrical side of your heat pump install.

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