14th September 2016


Air source heat pumps are designed to absorb heat from the air outside into a fluid, this fluid then passes through a compressor to then increase the temperature.

There are two types of air source heat pumps available –

  1. Air to Water Source that provides central heating as well as hot water.
  2. Air to Air Source that produces warm air circulated by fans.

What are the advantages of an air source heat pump?

  • Lower CO2 emissions
  • Lower energy bills
  • No fuel deliveries
  • Heating for your home and water
  • Potential income

 CTC EcoAir

The CTC EcoAir is the next generation of Air to Water heat pump development.

  •  A+ energy rating with a COP of 4.6
  • Intelligent defrosting for more heat and longer life
  • Heat operation down to  -22°C outside temperature
  • Quiet air/water heat pump
  • Produces up to 65°C Hot water
  • Electronic expansion valve for optimum operation
  • New efficient and reliable compressor
  • Condensation water tray with heater are built in as standard


Air to water heat pump
ctc eco zenith i250 pro

CTC EcoZenith i250 pro

The intelligent thermal store with up to 15kW power input and integrated heat pump control. A further CTC product evolution from the EcoEL with more efficient operation, and colour touch screen display.  CTC ecoZenith i250 can be connected together with CTC EcoAir 406-410 and EcoPart 406-410.

  • 4.3 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 circualtion (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
  • Allows for connection of other heat sources

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. It is 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

The benefits of air source heat pumps

  • Lower fuel bills
  • Potential income through the UK 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
  • Easier to install than a ground source heat pump.

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 for your home to be heated 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.

How do air source heat pumps work?

Heat from the air is absorbed at low temperature into a fluid. This fluid then passes through a compressor where its temperature is increased, and transfers its higher temperature heat to the heating and hot water circuits of the house. There are two main types of air source heat pump systems.

  1. Air-to-water
    An air-to-water system distributes heat through your wet central heating system. Heat pumps work more efficiently at a lower temperature than a standard boiler system would. This makes them more suitable for underfloor heating systems or larger radiators, which give out heat at lower temperatures over longer periods of time.
  2. Air-to-air
    An air-to-air system produces warm air which is circulated by fans to heat your home. They are unlikely to provide you with hot water as well.

Is an air source heat pump the right choice for me?

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

  • Do you have a space for it? You will need a place outside your home where a unit can be fitted to a wall or placed on the ground. It requires plenty of room around it to get a good flow of air. A wall that gets a lot of sun would be ideal.
  • Is your home well insulated? Since air source heat pumps work best when producing heat at a lower temperature than traditional boilers, it’s vital that your home is insulated and draught-proofed well for the heating system to work and be effective.
  • What is it replacing? The system will pay for itself quickly if it’s replacing an electricity or coal heating system, whereas heat pumps may not be the best option for homes using mains gas.
  • What type of heating system will you use? Air 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.

You may also want to consider ground source heat pumps, which use pipes buried in the garden to extract heat from the ground.