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Geothermal Installations Ground Source Heat Pump Ground source heat pumps (GSHPs) use electricity to ‘pump' heat from the ground into your house and can be an efficient and cost effective way to heat your home. Ground source heat pumps have a coefficient of performance of around 300%; however this is partly offset by energy losses created at the power station, resulting in performance slightly higher than a condensing boiler. GSHPs have a higher efficiency than equivalent air source heat pumps as the ground is typically at a higher temperature than the air, reducing the amount of electricity needed to heat the house. However, ground source heat pumps require water pipes be laid outside, either horizontally, or vertically. This increases the cost of a ground source heat pump system so needs to be weighed against any benefits. If you currently use gas for heating, disconnecting your gas connection will save the annual standing charge (around €307 / year). The heat pump is most cost effective when using night rate electricity and the operating profile should aim to maximise night-time running Air Source Heat Pump Air source heat pumps use electricity to ‘pump' heat from outside air and can be an efficient and cost effective way to heat the home. Air source heat pumps have a coefficient of performance of around 250%; however this is partly offset by energy losses at the electricity generating power station, resulting in performance comparable to a condensing boiler. Air source heat pumps require a defrost mechanism to prevent frost build up. The method of defrosting can affect the performance of the unit and is worth noting when selecting a unit. If you currently use gas for heating, disconnecting your gas connection will save the annual standing charge (around €307/year). The heat pump is most cost effective when using night rate electricity and the operating profile should aim to maximise night-time running. | ||||||||||||||||||||||||||||||||||||||||
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