Question 1

What size heat pump do I need for my house?

Accepted Answer

Most UK homes need a heat pump between 5-12 kW. A well-insulated modern home (post-2012) needs around 45 W/m², while an older uninsulated property may need 150 W/m². For an average 85m² house built between 1976-2000, expect to need around a 7-9 kW heat pump.

Question 2

What is the Boiler Upgrade Scheme (BUS) grant?

Accepted Answer

The Boiler Upgrade Scheme provides GBP 7,500 towards an air source heat pump or GBP 7,500 for a ground source heat pump for eligible homes in England and Wales. Your home must have an EPC certificate, and the installation must be by an MCS-certified installer. The grant is applied at the point of installation.

Question 3

Do I need to insulate my home before installing a heat pump?

Accepted Answer

It is strongly recommended. Heat pumps work most efficiently at lower flow temperatures, so good insulation reduces the heat loss and allows a smaller, cheaper heat pump. The MCS installer will assess your home and may recommend insulation improvements first. An EPC rating of D or above is ideal.

Question 4

How accurate is this calculator?

Accepted Answer

This calculator provides an indicative estimate using standard W/m² heat loss figures for different building ages. A professional MCS installer will conduct a detailed room-by-room heat loss survey (MIS 3005 compliant) before recommending a specific heat pump model. This is essential for a correctly sized system.

Heat Pump Sizing Calculator

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