Heat pump installation is growing fast in the UK, driven partly by grant schemes, and the trade rewards installers who take the technical groundwork, surveying and sizing, seriously from the very first job.
Never skip the heat loss survey
A proper room-by-room heat loss survey, not a guess based on the old boiler's size, is what a correctly sized heat pump depends on. Undersizing based on assumption is one of the most common causes of a cold-house complaint months after installation. Price the survey properly and treat it as essential, not optional.
Get MCS accredited before your first grant-eligible job
MCS accreditation is what makes customers eligible for the Boiler Upgrade Scheme grant, and it's a genuine financial detail for them, not just a technical credential for you. Many customers are specifically looking for this before choosing an installer.
Explain radiator upsizing at the survey stage, in plain language, before it becomes a surprise line on the final invoice. Customers who understand why upfront rarely push back on it later.
Expect to discuss radiator sizing on most jobs
Heat pumps run at lower flow temperatures than gas boilers, which often means existing radiators need upsizing to heat rooms properly. This is one of the easiest details to skip in an early sales conversation and the hardest to explain after work has started.
Set expectations about how a heat pump actually feels
Customers expecting identical behaviour to a gas boiler are more likely to call back with a complaint that isn't actually a fault. A short, honest explanation of running temperature and heating pattern differences upfront prevents most of these calls before they happen.
Budget more time for the sales conversation
Heat pumps are a bigger investment and a bigger behavioural change for a customer than swapping one boiler for another. Rush the consultation to get to a quote faster, and it tends to produce more cancelled jobs, not fewer, than taking the time to properly explain the system upfront.
Partner with a heating engineer if wet systems are new to you
Retrofitting a heat pump onto an existing central heating system depends on understanding that system properly. If your background is more electrical or general trade, a working relationship with an experienced heating engineer fills a genuine knowledge gap early on.
Be honest about running costs compared to gas
Some customers expect a heat pump to immediately and obviously cut their heating bills. Whether that happens depends heavily on their electricity tariff, insulation standard, and how the system is used day to day. It isn't automatic. Set this expectation honestly during the sales conversation instead of letting a customer assume based on marketing they've seen elsewhere, and you prevent a disappointed call after the first winter bill and protect your reputation as someone who gives straight answers instead of overselling the technology.
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