Example: Centralised System

If your educational facility has 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 pipeboreholes 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.

Costed example for water source

If your training centre has access to a stream, river, pond or lake, then you should consider using this as the heat source for your installation.

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

See example costs

Costed example for slinkies

If your school has playing fields, 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.

See example costs

Costed example for boreholes

Boreholes would be the best option if your school premises is sited in an urban area with restricted exposed land area.

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.

See example costs

Which RHI is right for me?

This scenario features a single commercial property on a single ground array.

This set up would be eligible for quarterly index-linked payments from the Non Domestic RHI for 20 years.

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

Find out more

Recommended Products

Plant Room Series

  • Ideal for commercial premises;
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Twin Compact Series

  • Designed for large domestic and small to medium-sized commercial applications;
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Related Content

Blog: Cascaded ground source heat pumps

If a commercial premises has a high demand for heating and hot water, then modular cascaded ground source heat pumps provide an effective solution to meet the heat load of the property.