The importance of correctly sizing your heat pump for your property

With a growing focus on sustainability and reducing environmental impact, more homeowners are now considering how to future-proof their homes which includes incorporating renewable energy technologies.

This includes Grant Aerona³ R32 air to water heat pumps, which are a popular heating choice, especially for new build and deep retrofit projects because they provide an energy efficient, sustainable, and cost-effective way to heat a home.
The award-winning, highly efficient Grant Aerona³ R32 air to water air source heat pump range has an ErP rating of A+++ with an SCOP of up to 5.4:1 and is available in outputs of 6kW, 10kW, 13kW and 17kW. The 13kW and 17kW models have also been recognised for their quiet operation by the internationally acclaimed Quiet Mark.
When installing a Grant Aerona³ R32 air source heat pump, it is essential that the system is correctly designed and sized. Low-temperature heating systems, such as a heat pump, have specific design requirements which must be met to ensure that the system can successfully meet the heating demand of the property.
A common misconception is that a bigger main heat source results in a more effective heating system, which is untrue. A heating system that has not been sized in line with a property’s requirements is most likely to produce inconsistent heat using more energy, leading to increased heating costs, reduced efficiency, potential maintenance issues and the heating system not living up to expectations.
Sizing requirements are based on the heat load requirements for each room in a property and these calculations can also determine the best suited technologies for the project.

Heat Loss Calculations
The first stage in the home heating design service offered by Grant begins when we receive your house plans. Using these plans, our technical specialists carry out in depth room by room heat loss calculations in line with SR:50 requirements. This information provides the heat load requirement for each room and helps to prove compliance with Part L of the building regulations and calculate the heat pump output, the hot water demands and underfloor heating and/or radiators for your home. If further information is needed, a member of our team will contact you as required.
Our team can work directly with the homeowner, the architect, engineer or specifier designing the property / heating system to ensure this is a hassle-free process and saves valuable time on the project. This service is free of charge and easy to avail of by simply sending your planning drawings to
Once heat loss calculations are finalised and the heat load for each room within the property is known, a correctly sized Grant Aerona³ R32 air source heat pump is specified for your property.
Find out more about the Grant Aerona³ R32 heat pump range here, and learn how quiet our heat pumps are here.