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My thinking of how a narrowboat should be is that an MHRV is essential equipment for live-aboard, but it brings one large question (below) for the BSS. What does it do? Mechanical = fans: Suck out the warm, stale, humid air... from the kitchen / shower. Suck in cold, fresh, dry air from outside, and try to do this in a balanced way so you're not pressurising the place. Heat Recovery (also Energy Recovery in hot places with aircon) = put a heat exchanger in with these fans: Use the outgoing air to warm up the incoming air. There are filters on both inputs to the heat exchanger, else it will clog up. Ventilation: send fresh and warm air to the opposite end of the boat. Heat recovery is never 100% efficient but can produce great savings. It also isn't useful as a heat source - you still need a heater somewhere. The heat recovery is also not meaningful or useful if there is no heating. Any MHRV is undermined by draughts, so houses with it fitted tend to be pretty much air-tight - let me know if you want a link to some youtube guys taking that to extremes. This is in the context of a live-aboard boat which will get some heavy-handed refitting after I find it. It will be a huge project, please wish me luck! My question is "Will having active ventilation remove the need for passive ventilation (ie. holes everywhere), which are normally required for BSS?" Or if it doesn't by itself, what else would need adding? If it has LPG / fuel gas on board I'll be removing that as soon as I have an alternative. I don't like it, it's too boomy for me. Solid fuel burning will be needed, but I want a balanced flue not a front-feed stove. That's a story for another day, but I also dislike having a potential carbon monoxide source in my box. I'm relying on the boat having plenty of electricity, which is also a story for another day. MHRVs last popped up in these old posts - Any thoughts appreciated!
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- mhrv
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