Can I Run Floor Heat From a Hot Water Heater?
MARK: Well, I was wondering if it would be cost-effective to run floor heat off of my gas water heater in my bathroom.
TOM: No. First of all, you have the initial installation of the piping under the floor. Secondly, a water heater produces hot water at around 110 degrees, which is not nearly warm enough to warm your floor. Hydronic heat using a boiler, on the other hand, is going to come out much, much hotter. More like maybe 160 degrees. And so you really can’t use a water heater to provide enough heat to deliver radiant heat.
Now, if – is this a new bathroom you’re putting in, Mark?
MARK: No. Matter of fact, it’s – there’s a crawlspace under it, too.
TOM: So, I think that you’re probably best just insulating that floor and not trying to heat it, because it’s an awful lot of work for just a bathroom to add that.
MARK: Right. Well, that answers my question.