Mechanical Ventilation with Heat Recovery
A MVHR ventilates a house while reducing heat-loss, using countercurrent heat exchange.
It’s a centralized unit that ventilates the whole house using ducting.
(For decentralized units see dMVHR)
For energy (air humidity ) recovering, see energy recovering ventilation, ERVs are better.
It’s recommend for buildings with good air tightness levels, e.g. air permeability of the thermal envelope at or below3 m3.hr/m2 @50Pa.
- more info
- an article about a single room MVHR (Vent-Axia HR25H)
- article that talks about ducting maintenance and filters
- article top 12 mistakes on installing
providers
- zehnder - top of the line?
- https://www.bpcventilation.com/ UK service, claims lowest price
- https://www.heatspaceandlight.com/contact-me/ UK service
- https://www.weare21degrees.co.uk/mvhr/components/
- https://www.blauberg.co.uk/homeowner great reputation
source: reddit
- Vent axia typical extract fans are good but their MVHR units aren’t,
- Nuaire also not great
- good: s&p energisave 250 (envirovent)
Tip
calculate the m/3 size of your accommodation and ask the supplier what m/3 size accommodation that model is designed for. You want to oversize your mvhr unit so you can have the fans running on a low setting this not only reduces the noise of the fans but also prolongs the life of the moving parts inside so less maintenance costs. Eg, for a 150 m/3 property u would specify a unit that can provide ventilation for a property at 180m/3 minimum.
Improves air quality, the ventilation reduces humidity, and the intake filter reduces pollen & dust.