Hot Water Systems
Geothermal Hot Water
For homes already running a geothermal heat pump for heating, the same loop can pre-heat your domestic hot water — adding negligible running cost.
For homes already running a geothermal heat pump for heating, the same loop can pre-heat your domestic hot water — adding negligible running cost.
Geothermal hot water makes most sense as a tag-on to an existing geothermal heating system. The ground loop and heat pump are already there — adding domestic hot water is a small incremental capital cost for excellent ongoing efficiency.
Standalone geothermal hot water (without heating) is rarely cost-effective — air-source heat pump or solar thermal will give better return.
Almost always as an add-on to an existing geothermal heating system. The ground loop and heat pump are already there — adding domestic hot water is a small incremental capital cost for excellent ongoing efficiency. Standalone geothermal hot water (without heating) is rarely cost-effective.
COP of 4.5–5.5 — the highest of any hot water source. Stable ground temperatures (14–18°C year-round at depth) mean efficiency stays consistent across seasons, unlike air-source which drops in winter cold.
50+ years for the buried pipework. The heat pump itself has a 15–25 year design life. Most cost is in the loop install — once it's in, it's there for the lifetime of the building.