A ground source heat pump, such as the Baxi Geoflo, is a popular option for those looking for a renewable and low carbon heat generation technology. It has the potential to reduce heating costs, depending on your current fuel type, and can provide substantial carbon savings over the unit's lifetime.
But how do you know if it is the right solution for your home and your heating needs? If you're considering having a ground source heat pump installed, it's worth noting the following points:
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Location
Ground source heat pumps circulate a mixture of water and antifreeze around a loop of pipe, called a ground loop, which is buried in the garden, so the most important consideration is the amount of land you have available and accessibility for digging equipment.
Depending on your energy needs and available space, the pipe is usually laid flat or coiled in horizontal trenches about 2m deep. The longer the ground loop, the more energy it produces. If there is not enough space in your garden or if excavating is not practical, vertical boreholes up to 100m deep are an alternative option; this method gives similar results but installation tends to be more expensive. The ground source heat pump itself should ideally be located away from the living area of the house, i.e. in a garage or outhouse. -
Insulation
Ground source heat pumps are most effective in homes that are well insulated with good draught proofing. This is because they work best at a lower temperature than conventional boilers. Good insulation could also mean you need a smaller and cheaper system. This will be a key factor in your decision if you have lots of large windows. -
Current fuel
Also important is the type of fuel you will be replacing. A ground source heat pump will save you more on your heating bills if you currently have an electric or coal heating system. It is not generally a cost-effective option if you have mains gas. -
Electricity tariff
When using a ground source heat pump you should consider using an electricity tariff such as Economy 10. Using a timer to turn the system on to coincide with the off-peak times will enable it to work more economically. -
Heating system
Because of the lower water temperatures required, ground source heat pumps work better with underfloor heating systems, large radiators or warm air convector fans than with standard radiators. -
Existing property or new build
Ground source heat pumps are best suited to homes in off-gas areas. Installation costs are generally lower in a new-build development than for an existing property as the work can often be combined with other building work.
