Why don't you tee teh hotwater line in your furnace room? I did that and it works perfect.
I teed the HW supply in my furnace room directly to an additional tap outside the house (like the garden hose) with a shutoff valve in the furnace room. When I wanted to flood the rink I'd turn the shutoff on and open the lne outside.
When I was done flooding I would turn the shutoff inside the house off and let the water drain and tehn shut the outside valve.
I'd send pictures but unfortunately this was at my last house in PEI which had a Huge rink for myself to practice on.
I'll be doing the same thing in my current house once the kids are old enought to skate
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