14th September 2016


What is a ground source heat pump?

A ground source heat pump is where heat from beneath the earth is absorbed at low temperatures within a coiled pipe that is buried under the ground. Within the coils of pipe there is a mixture of water and anti freeze that passes through a compressor that then changes it into a higher temperature, once this process has started it will then heat water for your heating system as well as water.

What are the benefits of a ground source heat pump?

  • Lower fuel bills
  • Could receive Rhi from the governments renewable heat scheme
  • No fuel deliveries
  • Heats both your home and water
  • Minimal maintenance

CTC EcoHeat, EcoPart, EcoPart XL

The CTC EcoPart is the new generation of ground to water heat pump development.

  • A+++ energy rating with a COP of 5.04
  • Equipped with a built-in control system for solid condensation/accumulator charging
  • Patented intercooler for longer life
  • The quietest ground/water heat pump we’ve ever produced
  • Produces up to 65°C Hot water
  • Electronic expansion valve for optimum operation
  • New efficient and reliable compressor
  • Built-in soft starter
ctc eco zenith i250 pro

CTC EcoZenith i250 pro

An intelligent thermal store with up to 15kW power input and integrated heat pump control.  CTC ecoZenith i250 can be connected together with CTC EcoAir 406-410 and EcoPart 406-410.

  • 3 colour touch screen with built-in control for heat pumps
  • Two immersion heaters with a capacity of up to 15kW, with current detection and modulation
  • Built-in circulation (low energy) pump for easy connection of the heat pump
  • Mixing valve for even heat distribution without noise
  • New efficient insulation
  • Cooling with accessories
  • 2 heating zone control

CTC EcoZenith i550 pro

The CTC EcoZenith i550 pro can control all components in one or more heating systems: Solar, pool heating, extra hot water and buffer tanks, electricity, wood, Oil, gas and pellet boilers. It can even control many different types of heat pumps and choose which one to go into service for the best economy. Suitable to connect with CTC EcoAir 400 and EcoPart 400 product range. The CTC EcoZenith i550 pro provides plenty of hot water. At a flow rate 22 litres per minute the capacity is more than 600 litres of 40oC hot water and 300 litres at 40 litres per minute. CTC EcoZenith i550 pro is only 1700 mm high and can be placed in rooms with low ceilings.

Thermal Stores Wales

Ground source heat pumps use pipes which are buried in the garden to extract heat from the ground. This heat can then be used to heat radiators, underfloor heating or warm air heating systems and hot water in your home.

Ground source heat pumps circulate a mixture of water and antifreeze around a loop of pipe, called a ground loop, which will be buried in your garden. Heat from the ground is absorbed into the fluid and then passes through a heat exchanger into the heat pump. The ground stays at a fairly constant temperature under the surface, so the heat pump can be used all year.

The length of the ground loop depends on the size of your home and the amount of heat you require. Longer loops draw more heat from the ground, but they need more space to be buried in. If space is limited, a vertical borehole can be drilled instead.

What are the benefits of ground source heat pumps?

  • Lower fuel bills
  • Could provide you with income through the government’s Renewable Heat Incentive (RHI)
  • Lower home carbon emissions
  • No fuel deliveries needed
  • Heat your home as well as your water
  • Minimal maintenance required

Different to gas and oil boilers, heat pumps deliver heat at lower temperatures over much longer periods. During the winter they may need to be on constantly to heat your home efficiently. You will also notice that radiators won’t feel as hot to the touch as they might do when you are using a gas or oil boiler.

Air source heat pumps are usually easier to install than ground source as they do not need any trenches or drilling, but they are often less efficient than ground source heat pumps. Water source heat pumps can be used to provide heating in homes near to rivers, streams and lakes.

How do ground source heat pumps work?

Heat from the ground is absorbed at low temperatures into a fluid inside a loop of pipe – a ground loop – that is buried underground. The fluid then passes through a compressor that raises it to a higher temperature, which can then heat water for the heating and hot water circuits of the house. The cooled ground-loop fluid passes back into the ground where it absorbs further energy from the ground in a continuous process as long as heating is required.

Usually the loop is laid flat or coiled in trenches about two metres deep, but if there is not enough space in your garden you can install a vertical loop down into the ground to a depth of up to 100 metres for a typical domestic home. Heat pumps have some impact on the environment as they need electricity to run, but the heat they extract from the ground, the air, or water is constantly being naturally renewed.

Is a ground source heat pump right for me?

To find out if an air source heat pump is the right choice for you, there are a few key questions to consider:

  • Is your garden suitable for a ground loop?  Your garden doesn’t have to be particularly big, but the ground does need to be suitable for digging a trench or a borehole and accessible to digging machinery.
  • Is your home well insulated? Since ground source heat pumps work best when producing heat at a lower temperature than traditional boilers, it is vital that your home is well insulated and draught-proofed for the heating system to work effectively.
  • What will you be replacing? The system will pay for itself much more quickly if it is replacing an electricity or coal heating system. Heat pumps may not be the best option for homes using mains gas.
  • What type of heating system will you use? Ground source heat pumps can perform better with underfloor heating systems or warm air heating than with radiator-based systems because of the lower water temperatures required.
  • Is the system intended for a new development? Combining the installation with other building work can reduce the cost of installing the system.