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12 KW Heat Pump, PV & Underfloor for a New Build in Hertfordshire

Better Planet was instructed to design, supply, and commission a ground source heat pump, underfloor heating, and solar PV for this luxury property in Hertfordshire.

As no gas from the grid was available and planning required the use of a low-carbon heating system, a heat pump was a natural choice. With plenty of land available for horizontal ground loops, the ground source was a more attractive alternative than an air source. Despite a higher initial outlay, the ground source typically beats the air source financially in the long run, especially taking into account the higher tariffs from the Renewable Heat Incentive Scheme. Furthermore, the ground source is slightly more efficient than the air source, resulting in lower operating costs.

Underfloor heating in screed throughout. Like all projects, Better Planet designed the system to operate at consistently low temperatures, taking into account room-by-room heat losses and floor coverings.

Solar PV is a great way to generate your own electricity and it is a good complement to a heat pump as the system can generate some of the electricity required to run the heating system. In this case, an immersion heater controller was added to the system, diverting electricity to the immersion heater in the hot water cylinder as a means to use more electricity on site.

Location: Hertfordshire

Project Summary:

Ground Source Heat Pump
  • A Nibe F1145-12kW ground source heat pump
  • A 300-litre heat pump cylinder
  • A 200-litre buffer tank
  • Two horizontal collector loops, 300 meters each
  • Nibe Uplink allowing remote monitoring through the internet
  • Estimated RHI payments: £21,903 over 7 years
Underfloor Heating
  • 16 mm underfloor pipes from LK in screed throughout
  • Manifolds from Larsson Underfloor
  • Controls from Heatmiser
Solar PV
  • 16 panels from Amerisolar with a total output of 4kWp
  • Inverter from Solis
  • Flat roof mounting system from AluGrid
  • An immersion heater controller from Apollo Gem
  • Estimated Feed Tariffs and savings over 20 years: £16,495
  • Controls from Heatmiser

Comment from the customer…

We are still very cosy here and are still using the economy setting on the ground source heat pump.

I think our last quarterly electric bill was £190 and the solar panel payback was around £130. It is very exciting to be so efficient!

Oliver Larsson Sales Manager

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