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Heat PumpFoweyOil ReplacementMitsubishi

12 kW Mitsubishi Heat Pump in a Stone Cottage Near Fowey

An oil-to-heat-pump switch in a large Cornish stone cottage outside Fowey. With oil prices remaining volatile, the customer switched to a 12 kW Mitsubishi Ecodan heat pump, claiming the up-to-£9,000 BUS grant and cutting their heating costs by an estimated 40%.

Location: Fowey Property: 4-bedroom detached stone cottage Completed: December 2025 Grant: up to £9,000 Boiler Upgrade Scheme
12 kW Mitsubishi Heat Pump in a Stone Cottage Near Fowey

The Challenge

The property was heated by oil with a mix of older large radiators and a warm-air unit in the main living area. The traditional stone construction meant higher heat loss than a modern property, requiring careful system design to ensure comfort in all weather.

Our Solution

A detailed heat loss assessment showed that the existing radiators were largely adequate at the lower flow temperatures required, with two needing replacement. We replaced the oil boiler, oil tank controls, and installed the 12 kW Mitsubishi Ecodan with a new 300-litre cylinder.

The Outcome

The customer has seen their annual heating costs fall from approximately £2,400 on oil to an estimated £1,400 on the heat pump — a saving of £1,000 per year. They are now exploring solar panels to power the heat pump during daylight hours.

System Installed

12 kW Mitsubishi Ecodan ASHP, 300L Mitsubishi hot water cylinder, MELCloud controls, 2 new radiators

Grant Claimed

up to £9,000 Boiler Upgrade Scheme

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