MVHR (Mechanical Ventilation and Heat Recovery)
These systems recycle heat – and not any smells! – from the stale air that is leaving your home. As the stale air leaves it passes through a heat exchanger that uses the heat from the outgoing air to warm fresh, incoming air.
Your home will need to be fairly airtight so that you can control when the air enters or leaves and therefore this system is typically used in newer or smaller homes.
The typical cost is around £6,000, including installation, but this will depend on your particular circumstances. The Energy Saving Trust suggests that the cost of installation for a 3 bed semi -detached house could start from £1,800, dependent on the size of the system and ease of installation of the ductwork.
MVHR also requires ducting to be installed, which might present problems when retrofitting a house rather than incorporating it into a new build.
There is some maintenance required, mainly cleaning and balancing of the system. Filters that clean the incoming air may need to be changed as often as every 3 months. The life time for the fan unit should be about 15 years.
Single Room Option
It is possible to use this system in a single room. In this case it is called a Single Room Heat Recovery Ventilator (SRHRV).
Benefits & Savings
The benefits are numerous:
- Increased energy efficiency; manufactures of systems claim that they can save up to 90% of the heat that leaves a building during winter
- The air is cleaned reducing general dust in your home – Kitchen smells and steam are quickly removed
- Moisture is quickly removed from the shower and bathrooms, reducing condensation in wet rooms and lowering humidity so that towels etc can dry
- Significantly better air quality which is thought to reduced frequency of asthma attacks
- Use can extend the time before it is necessary to turn on the central heating
- How do air source heat pumps work?
- A box on the outside of your house called the air handling unit takes in outside air and then transfers the heat energy from the air to a fluid through large heat exchangers . The fluid is then compressed in a heat pump to raise the temperature to a level that means it can be used in your home as heating and hot water.
- Do air source heat pumps work all year round?
- According to air source heat pump manufacturers they are efficient down to air temperatures of -20°c, which means that they are more than suitable for installations within the UK. Heat pumps can produce water heated at 55C all year round in the UK without the aid of electrical immersions.
- Will an air source heat pump provide enough hot water for heating and hot water?
- If you do not heat your water beyond 55°C and your system has been correctly scaled and fitted for your needs there is no reason why all your domestic hot water requirements shouldn't be provided by the air source heat pump throughout the year. It should be noted that heat pumps produce water at a lower temperature than boiler systems, meaning that you will need larger radiators or an underfloor heating system or the pump to heat your house effectively.
- Will I need a new boiler to install an air source heat pump?
- An air source heat pump can provide all your hot water and heating requirements without the need for top-up from a boiler. However, a boiler can be used alongside the pump system as a top up to meet demand in colder weather. This will depend on your current heating system's design.
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