Project: Glenfinnan Heat Pump

Technologies: Heat Pumps

Contact: Graham Moss

Graham Moss recently installed an air source heat pump into his 120m² home in Glenfinnan, replacing an old oil grahamcombi boiler and running under floor heating right through. The pump is situated outside the new porch extension and has been operating successfully for around 18 months. Graham is a qualified installer for Ecoliving, an accredited Glasgow company specialising in the distribution of heating, ventilation and cooling systems, and has installed several air source, ground source and air recovery systems throughout Lochaber


There are several pumps available on the market. Which pump did Graham use and why?

Graham has used a pump designed by NIBE, a Swedish company specialising in heat pumps for the domestic sector.air source heat pump 2 All of the NIBE heat pumps are on the EST list of accredited equipment. The actual pump used was chosen taking into account the heat loss of the house and the hot water requirements.


What does it all cost to install the pump?

In a new build, the pump, plus installation (appropriate plumbing, labour and hot water cylinder) costs around £7-8,000, however 30% of that can be claimed back in the form of a grant from the EST as soon as the work is commissioned.

How much does it cost to run the heat pump?

Graham reckons it costs around £70/month to provide all the hot water and heating he needs – much less than the oil was costing for the old boiler

Can the pump run radiators or is it only suitable for under floor heating?

All of the NIBE heat-pumps can run both radiators and underfloor heating, either individually or in combination. This is possible because the pump can produce two different temperature flows. Ideally the radiators fitted would be designed for a 50°C flow; however turning down the boiler to 50°C with existing radiators would have a similar effect. The pumps are also “weather compensated”; meaning that the flow temperature in the heating system is based on the outdoor air temperature, therefore as it gets warmer outside, the temperature of the heating system reduces. This balances the heat losses from the house making the indoor temperature more constant and cheaper to run!

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