I’m thinking about putting a tankless water heater into a shop with a 100 A feeder. Based upon groundwater temperature where I am, the model I’ve selected runs on 240 V and requires:
a minimum 125 amp electrical panel for installation with (1) 60 amp double pole breaker connected to (1) set of #6 awg wire.
I suspect that the requirement/recommendation for a 125 A panel is simply so that you aren’t using more power than your service can supply in case the tankless heater is running at the same time as several other appliances that are using electricity, though I’m not an electrician. My questions are:
(1) Does the electrical code (I’m in Canada) specify the maximum breaker amperage for a given panel amperage.
(2) If the code doesn’t prohibit this setup, is it otherwise unwise to do so.
In case it matters, this tankless heater would only be used to supply a utility sink faucet primarily used for hand washing. There are some other relatively large current draws in the shop, but since I’m generally the only one working in it I don’t expect to be washing my hands and, say, welding at the same time.