Can radiators be used instead of underfloor heating?
Yes, but you may need larger radiators, sized for the typical 45°C to 50°C water temperatures obtained from efficient ground source heat pump systems. If your house is well insulated they may be suitable. If your house is not well insulated you will want to improve the insulation or install a heat pump capable of delivering higher water temperatures. Your installer will need to check the capacity of your radiators matches the heat output of the heat pump specified and the heat losses of your house. Modern die cast aluminium radiators are very efficient and smaller than conventional radiators. Upstairs is usually less of a problem as bedrooms are normally kept at lower temperatures.
Can the heat pump be installed outside or in a car-port, garage or basement?
Yes. This normally means the pump will be nearer to the pipe connections to your ground loops, which often makes the whole system easier to connect.
Will long trenches have to be dug on my land for the ground loops?
My land is too rocky to dig trenches – can I still fit a heat pump system?
I don't have enough land to dig long trenches – what do I do?
Vertical boreholes can be used for heat exchange with the ground instead of trenches.
How big are the trenches?
A typical heating-only installation for a medium sized, new build detached house would need two narrow trenches, each 300 mm wide and 40 to 50 metres long and 2 metres deep. The trenches can be straight or curved and laid in any direction to suit your site, providing they are five metres apart. A standard excavator can dig the trenches and backfill them after the ground loops have been installed. Your installer would be able to do this work and plan it to ensure the minimum of disruption to your site. Once the ground loops are installed, pressure tested and buried, your renewable energy collection system should need no further attention. However, its location needs to be recorded to avoid it being accidentally disturbed!
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