Electric On Demand Water Heater
We are looking at a project to finish a space above a detached garage. The company constructed the garage structure itself roughly 15 years ago.
The space will contain a kitchen sink and a bathroom. No dishwasher, the bathroom will contain a shower. The space will see minimal use as a guest suite for relatives and also serve as a media room for the homeowners on occasion. Taking the minimal use into consideration I’d like to stay away from a standard tank water heater
A gas line to the structure would be cost prohibitive, at least at this point, though it may be the only option.. So, I need to find an electric on demand unit with one problem. My plumber said he is going to research it however the only unit he know’s of that has a flow rate high enough to service a shower requires three 30amp breakers and I don’t have that kind of power. I can’t remember the current service how ever I am assuming 200 AMP The garage currently has a 100 AMP sub-panel in it. I’ll confirm that when I am over there with the plumber next week showing him the job.
Check on the acutal flow rate needed.
I have never looked at the specs, but I think that there are small ones available.
One shower (just don't remove the low flow insert) is all you need to support at one time.
Poor man's solution, which does require a bit of "maintenance" is to install a conventional tank electric heater, keep it drained until the day before your guests arrive...or even an hour before you need to use the shower, then fill it up and switch the power to it. Turn it off and drain it after they leave. Have to make sure, of course, that no one ever misunderstands and turns power on before fillup.