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MVHR Efficiency


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Hi,

 

I'm trying to compare quotes for MVHR and its like comparing apples with oranges it seems. Anyhow what level of efficiency should I be aiming at?

 

The units I've got quotes for thus far range from 57% (NIBE) to 90% (Zehnder)

 

The quote difference between these 2 installed is £3000 !

 

More info here:

https://database.passivehouse.com/en/components/details/ventilation_small/nibe-ab-nibe-ers-20-250-1301vs03

https://database.passivehouse.com/en/components/details/ventilation_small/zehnder-group-nederland-bv-comfoair-q350-hrv-comfort-vent-q350-hrv-0956vs03

 

Any pointers most welcome

 

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80-90% has to be the minimum and I can’t see how one below that is on the passiv database, don’t think it’s on the SAP one which means it’s not recognised for SAP scoring if I understand correctly. 

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The NIBE one you link has 

Heat recovery rate: 79 %

 

What am I missing?

 

Also note, like windows, PHI a different way of calculating effeceiency to everyone else so either just use their numbers or the manufacturer numbers but don't try and compare across them

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3 hours ago, joth said:

The NIBE one you link has 

Heat recovery rate: 79 %

 

What am I missing?

 

Also note, like windows, PHI a different way of calculating effeceiency to everyone else so either just use their numbers or the manufacturer numbers but don't try and compare across them

 

hi @joth yes my mistake - I was looking at the efficiency ratio.

 

Whats PHI?

 

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1 minute ago, gc100 said:

 

hi @joth yes my mistake - I was looking at the efficiency ratio.

 

Whats PHI?

 

 

Passivhaus institute, that make the rules of passive house and who's database you linked above. 

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