HEAT PUMPS The evolution of GSHP T


he Government is aiming for four million heat pumps to be installed in residential properties by 2030, as ground source heat pumps


(GSHPs) are seen as a ‘strategically important technology for decarbonising heat’. This is encouraging news for the renewable industry, as installers who are willing to include heat pumps in their repertoire of services have the promise of new business opportunities. But what can the wider industry do to support the Government’s ambition? The Renewable Heat Incentive (RHI) compensates homeowners with a long term rate of return and fast payback for installing renewable technologies such as GSHPs. To maximise returns from the RHI and the benefits of GSHP technology, GSHP manufacturers are developing innovative models that offer improved efficiencies from an end user perspective and clever design features that will ensure easy installation.


Market leading innovation


Kensa Heat Pumps has recently launched its Evo Series of GSHPs said to deliver 15% efficiency improvements over its predecessor model resulting in improved energy savings, maximising customer returns through the RHI. According to the manufacturer it also has a number of design


features that ensure it is simple and easy to install. Guy Cashmore, founder and technical director at


Kensa heat Pumps comments: “In designing the series we set out to deliver a worthy successor to the Compact. We listened to our customers, both installers and end users, whose feedback fed directly into the design.”


Efficiency and ease of installation


In order to deliver an ultra-efficient and easy to install ground source heat pump, Kensa overcame many design challenges, as Mr Cashmore explains: “Getting the very best efficiency out of any heat pump system requires careful setting up and usage, but how does an installer know if making a change has made things better or worse? Kensa’s Evo features a 'live' CoP (Coefficient of Performance) readout that comes directly from the operating conditions, allowing installers to gain real-time information from the heat pump. “Aside from the advanced controller panel, the


actual controls are straightforward. Having simple controls also future proofs the product for future use with battery storage systems and phase change heat storage - both of which are close to becoming mainstream. This allows the heat pump to run as a


simple 'on demand' unit, with control coming from elsewhere. For now, controls can be as simple or complex as the customer wants, and installers are not forced down any controls route, it has loads of features available, but will happily function with a simple room thermostat,” says Mr Cashmore. “Domestic hot water systems using heat pumps


always require close attention from the installer to get good results. A self-adjusting pressure controlled system helps with this. For retrofit and demanding installations, an optional use DHW boost controller is synchronised to the heat pump cycles, minimising any additional energy use.” “Also, water pumps for both the ground and heating side are built in, saving time during installation and ensuring the pumps are right for the job. Pump speed is adjustable via the touch screen during commissioning and the heating pump can automatically drop back to a low setback speed during compressor off periods if desired, saving even more energy.”


GSHPs are key in the future of home heating


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