dMEVs and Heat Loss

[John288]

We are thinking to install three dMEVs in the house. One in the kitchen, one in the toilet upstairs and one in the toilet downstairs.

 

We have recently got a heat pump installed which is working well.

 

Would the dMEVs significantly increase my heat loss and thus my heating bill?

[JohnMo]

1 minute ago, John288 said:

Would the dMEVs significantly increase my heat loss and thus my heating bill?

No, they are providing a low background ventilation and depending on how they are setup will make a real difference.

 

But to perform well they need proper cross flow ventilation. So you need trickle vents in dry rooms and they cannot be closed - better if you install humidity activated ones. 

 

Does your dMEV fans have automatic boost based on humidity if so make sure they are set to in that mode. 

 

To get least heat loss you need to minimise ventilation and only boost when needed based on humidity, not just because someone switches a light on.

 

Are those your only wet rooms in the house?

[Dave Jones]

used the blauberg units on a friends house, very impressed with them.  not cheap though. They can be 'meshed' together to provide cross ventilation if needed. Bathroom have different model than the living area versions to handle the moiusture. the kit is very good and provides for an air tight install.

 

shame they are not MCS certified.