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
- Do air source heat pumps come with a warranty?
- Most air source heat pump installations include warranties for parts and labour. You should check your quote or the pump's product details to find out how long that model's warranty is.
- How much noise do air source heat pumps generate?
- Most modern air source heat pumps are fairly quiet. The noisy part is the air handling unit, which makes a similar level of noise as an air-conditioning unit. The heat pump itself, which is often installed inside, makes a noise too, but this is typically no more than the noise of a fridge.
- Where in my house should an air source heat pump be installed?
- The bulkiest component of an air source heat pump is the air handling unit, which must be fitted outside. The unit can be fitted on an outside wall, but some designs allow this to be fitted some way away from the home, as far as 20-30 meters. The heat pump needs to be in or on the house and typically this is where the essential components are housed.
- 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.
- Can I heat my swimming Pool with an air source heat pump?
- Air source heat pumps are ideal for pools. Note that for existing swimming pools the current heat exchanger would need to be changed.
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