gc100 Posted August 22, 2019 Share Posted August 22, 2019 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 Link to comment Share on other sites More sharing options...
PeterW Posted August 22, 2019 Share Posted August 22, 2019 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. 1 Link to comment Share on other sites More sharing options...
SteamyTea Posted August 23, 2019 Share Posted August 23, 2019 There is quite a difference in the power of the units. 0.33 or 0.24 Wh.m-3 And the sound levels. Seems to me that the more expensive on is a lot better. Link to comment Share on other sites More sharing options...
joth Posted August 23, 2019 Share Posted August 23, 2019 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 1 Link to comment Share on other sites More sharing options...
gc100 Posted August 23, 2019 Author Share Posted August 23, 2019 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? Link to comment Share on other sites More sharing options...
joth Posted August 23, 2019 Share Posted August 23, 2019 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. 1 Link to comment Share on other sites More sharing options...
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