Heat Loss Survey Guide
Why a Heat Loss Survey is essential for heat pump installation, what it involves, and how it ensures your system is sized correctly.
What Is a Heat Loss Survey?
A Heat Loss Survey calculates exactly how much heat your home loses. This tells installers what size heat pump you need to keep your home warm.
Critical Fact
A Heat Loss Survey is required for the £7,500 BUS grant. Do not let any installer skip it.
Why Is It Important?
1. Prevents Oversizing
Many installers default to oversized heat pumps. This causes higher costs, reduced efficiency, and shorter lifespan.
A proper survey might reveal your home needs a 5kW heat pump when an installer would have quoted 8kW. That saves £2,000-£3,000.
2. Prevents Undersizing
An undersized heat pump will not keep your home warm on the coldest days. The survey calculates demand at the coldest expected temperature.
3. Required for BUS Grant
The £7,500 Boiler Upgrade Scheme grant requires a Heat Loss Survey. Without it, you will not get the grant.
4. Tells You About Radiators
The survey determines whether your existing radiators work with a heat pump, or if some need upgrading. About 70% of UK homes can keep existing radiators.
What Happens During the Survey?
A qualified surveyor will visit your property and:
- Measure every room
- Assess wall construction and insulation
- Check loft insulation depth
- Measure windows and doors
- Review current heating system
How Long Does It Take?
- Small property (2 bed): 1.5-2 hours
- Medium property (3-4 bed): 2-3 hours
- Large property (4+ bed): 3-4 hours
Red Flags: When Installers Skip the Survey
Some installers try to skip the Heat Loss Survey. Common excuses:
"We can estimate from your EPC"
Wrong. EPCs are generic and often inaccurate. They do not measure actual radiator sizes or specific heat loss.
"We size based on property type"
Wrong. A standard 3-bed semi could need anywhere from 5kW to 12kW depending on insulation, age, and location.
If an installer will not do a proper Heat Loss Survey, find a different installer.
Bottom Line
Never install a heat pump without a proper Heat Loss Survey. It is required for the BUS grant, prevents expensive mistakes, and ensures your heat pump performs efficiently for 20+ years.
Get Quotes from Proper Installers
We only work with MCS-certified installers who perform proper Heat Loss Surveys.
Get Free Quotes