Let me be the first to ask why you would want to heat hot water?
As for refilling water heaters, the relief valve at the top does not need to be opened to ensure the tank is filled properly, just the hot water tap** farthest** down the line.
Let me be the first to ask why you would want to heat hot water?
As for refilling water heaters, the relief valve at the top does not need to be opened to ensure the tank is filled properly, just the hot water tap** farthest** down the line.