GEOTHERMAL TECHNOLOGY

Ground source heat pumps work in the same way as a domestic fridge. They take heat from the ground (which is at a constant temperature of about 12 degrees celcius at 2 metres below ground level) and use a refrigerant heat pump to convert it to the required temperature for under floor heating. An electric element provides a top up for the hot water. Industry estimates suggest that in addition to substantial reductions in carbon output the occupier can expect an annual cost saving of up to 50%.

The main focus over the last few years has been on improving the performance of new buildings, through the tightening of Building Regulations and the new Code for Sustainable Homes. The target has been set for all new-build homes to be by definition, zero carbon by 2016. We now fit Ground Source Heat pumps to feed the heating and hot water systems to all of our houses.

This system is the solution of choice for meeting Carbon reduction targets, because of the significant amount of renewable energy delivered and the real difference that can be made to the energy use of a building. The system circulates water and antifreeze through pipes (slinkys) buried either horizontally or vertically in the ground. The average temperature below ground in the U.K being is between 8C and 13C, and this temperature remains constant throughout the year.

The benefits of geothermal systems are:

• Cost-effective Carbon Footprint reduction with provision of reliable, available and affordable renewable energy.
• No requirement for gas/oil supply, and significant reduction in electricity requirements.
• For every unit of electricity used to pump the heat, 3-4 units of heat are produced.
• Considerable reduction in annual fuel costs.
• A ground source heat pump works efficiently with the under-floor heating.
• The Slinkys have a minimum life span of 50 years.

As you would expect there are a variety of alternative heating systems coming to the market at the moment. We continue to monitor the efficiencies, economies and environmental benefits of these and will be making new introductions in our houses as we see appropriate.