air. They can recover 100 per cent of indoor heat, allowing users to obtain 4kW of heat energy from 1kW of power. This premium HRV unit with integral heat
pump can therefore form part of a low-energy heating solution for your home. Whether com- bining with a wood burning stove and towel radiators, or by reducing underfloor heating to the ground floor only, this system can increase the flexibility and reduce the capital outlay of your heating system. In the summer months, the heat pump can be reversed to provide fresh cooled air for those sticky summer nights. There are also compact service units on the market, for smaller homes, with heat recovery ventila- tion, space heating and domestic hot water all from one unit – great for off-gas homes.
site by others. Small bore flexible ducting, restricts airflow so much, that however efficient the MVHR unit appears on paper, it won’t be in practice. Ducting also needs to be insulated cor- rectly otherwise heat will be lost. There’s no point having the most efficient HRV
system, if you only have an on/off button. The best HRV units should have a controller that ensures the system is perfectly set up for your house and your lifestyle with:
• 24/7 timer • Room and external temperature monitors • An SD card for data collection • Cold weather, reduced supply rate function • Boost function in several increments
Main benefits of HRV
Constant fresh air, filtered for pollen and allergens down to 0.01 microns
Reduced VOC’s/CO2 for a healthier environment in which
to breathe
It’s quiet, with no noise from extractor fans or from outside
More secure living as windows won’t be left open overnight
Reduced humidity levels, so less inviting for dust mites
Cost savings, with heat recovered in winter, comfort cooling in summer
No mildew or mould as stale air is removed, prolonging your house life
Constant odour removal replaced with fresh filtered air
With regards to the veins of the system, it is very important to get the ducting to each room right. 100-200mm rigid metal ducting is best for air- flows and hygiene (plastic ducting isn’t naturally antibacterial) and is unlikely to be damaged on
The principle behind heat recovery ventilation is firmly grounded in the drive for sustainability and reducing our reliance on fossil fuels. Obviously, the more heat we recover, the less we need to generate…
Exceeds Building Regs Part F, SAP Appendix Q & Passivhaus certified.
Enq. 123
Enq. 124 selfbuilder & homemaker
www.sbhonline.co.uk 35
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