Farmhouse heat-pump replacement, Tarporley
16kW Mitsubishi Ecodan replacing a failed LPG boiler in a six-bedroom farmhouse. Significant radiator review needed.
The Pearsons run a smallholding outside Tarporley — a six-bedroom 1820s farmhouse with a barn conversion attached. The LPG boiler that had been heating both buildings failed in October 2025, and the LPG bills the year before had already prompted a conversation about alternatives.
The heat-loss calculation came in at 15.2kW for the worst-case winter day across the combined house and barn. We specified the Mitsubishi Ecodan PUZ-WM112VAA 16kW, with a 300-litre cylinder in the utility room and a buffer tank to handle the long pipework runs to the barn.
The radiator review was significant. Twelve of the existing radiators were too small for the lower flow temperature a heat pump runs at, and four of them were swapped for double-panel doubles during the install. The other eight were already generously sized and stayed put.
Six-day install across two weeks because the LPG tank decommissioning had to be scheduled separately. The Pearsons reported running costs roughly half of the LPG system in their first quarter on the heat pump.
What went in.
The bill of materials, in mono. We publish this on every install — it's the same document the customer gets in their commissioning pack.
- Outdoor unit
- Mitsubishi Ecodan PUZ-WM112VAA · 16kW
- Cylinder
- Mitsubishi 300L unvented
- Buffer tank
- 50L (long-run isolation)
- Radiators replaced
- 4 of 12 (kitchen, hall, two bedrooms)
- SCOP @ 45°C
- 4.55
- Refrigerant
- R32, 5.4kg
Six-bedroom farmhouse, LPG boiler died in October. Marshall did the heat-loss calculation properly, told me which radiators needed swapping (only four of twelve, lower than I'd been quoted elsewhere), and got the heat pump in within two weeks. First quarter on the new system was about half what we were paying for LPG. They know what they're doing and they don't oversell.
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