Example: Centralised System

If you are developing commercial premises with a high demand for heating and hot water, then an effective solution can be to link a number of heat pumps together in a ‘cascaded system’ fed by a central ground array.

High heat loads can be effectively met with a ‘cascaded system’ design, as the ground array, whether it be coiled slinky pipe, boreholes or pond mats, is sized to deal with the peak heat demand.

Benefits of a cascaded system

The cascaded system design can flex between periods of minimum and maximum heat demand; for example during the spring and summer when the need for heat is lower, only one heat pump need be in operation, with subsequent heat pumps coming into operation as the heating season progresses.


Another benefit of the system design is that, depending on the heat pump selection, it can be configured to provide 60°C hot water at the same time without the need for an additional immersion heater.


Do you have a water source?


Water is an excellent conductor of heat and therefore water source ground source heat pump systems are extremely energy efficient.

If your development has access to a stream, river, pond or lake, then you should consider harnessing this freely available heat source.

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Do you have lots of land area?


If the property is rural and surrounded by lots of exposed land area, then slinkies would be a viable option for a ground source installation.

Slinkies are the name given to coiled pipe buried in trenches at a depth of 1-2m where the ground temperature remains constant all year round.

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Do you have limited land area?


If the complex is in an industrial area for example and has limited exposed land, then boreholes would be the best option.

Boreholes can usually be drilled into any type of ground and are a perfect space-saving solution, as the depth of the hole(s) is varied to suit the heat requirement.

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Which RHI is right for me?

The Renewable Heat Incentive (RHI) pays you for the renewable heat your ground source heat pump produces.

In this example, a domestic and commercial property feature a cascaded heat pump system on a shared ground array.

This scenario would be eligible for the Non Domestic RHI.

Don’t think this scenario applies to you? Click here for other options.

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Recommended Services

Kensa Contracting

Kensa Contracting provides a complete turnkey service from feasibility study, through to design, full project management as well as installation and commissioning. And of course the heat pumps are manufactured by Kensa Heat Pumps, too.

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Kensa’s MCS Umbrella

If you or your own preferred installer will be undertaking the installation, Kensa’s MCS Umbrella Service offers full MCS compliance for those who are not yet MCS accredited, or simply require design support.

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