All 24 homes in Phase One of a Tulloch Homes development have been sold, each fitted with a QUHZ Ecodan air source heat pump, HPA UK reported on 17 February 2026. The site, described as a development of 2 and 3 bedroom homes in a Highland village, includes a mix of social and private properties, all of which use the heat pump for heating and hot water1.
The case study states that the units were specified to be compact, quiet and energy efficient. The QUHZ Ecodan uses CO2 as a refrigerant and delivers water at 70°C to a packaged 200 litre thermal store. HPA UK says the model is designed with new-build standards of insulation and lower heating loads in mind, and lists the installed unit as a 4kW air source heat pump1.
"All of the homes in Phase One have now been snapped up and Tulloch Homes are anticipating similar interest once Phase Two is completed."
Gordon Macallister of Highland Plumbing & Heating, which installed the systems, said low maintenance and reliability matter from both the customer and installer perspective, and that running costs are comparable with natural gas but without the emissions1. Tulloch Homes is described as having a 95-year history, and the properties come with a 10-year NHBC warranty1. The number of homes planned for Phase Two, and its completion date, have not been reported.
| Item | Detail |
|---|---|
| Homes in Phase One | 24, all sold |
| Heating system | QUHZ Ecodan air source heat pump, 4kW |
| Refrigerant | CO2 |
| Hot water | 70°C to a packaged 200 litre thermal store |
| Warranty | 10-year NHBC |
| Tenure mix | Social and private |
Why it matters for households
The development shows a new-build site where every home in the first phase relies on a heat pump rather than a gas boiler, including social housing as well as private sale properties. For a household weighing up a heat pump, the specification points to the factors that shape running costs and comfort: the unit's output is matched to the home's insulation and heating load, and hot water is stored in a 200 litre cylinder rather than produced on demand. The installer's claim of running costs comparable with natural gas is a statement about this site and its new-build fabric, not a general figure for the existing housing stock, and no measured performance data for these homes has been published. How a heat pump performs in practice depends on the building, the system design and how it is operated, which is covered in our guide to how heat pumps actually perform in UK homes.
What happens next
Phase Two is expected to draw similar interest once completed, according to HPA UK, which gives no date for that completion1.
Sources1 cited
- Mitsubishi Electric, Tulloch Homes - HPA UK, hpauk.org.uk