Does this look like it could work?
Here's what I'm thinking. Hook up the hot water coil, hwc, and have a line controlled by valves whether we want to send directly to the water heater an a spare tank, or out to melt the ice under the sidewalk. I have to take up the stones and tamper the ground anyway, why not run a line out to keep the ice away?
basic idea the old water feeds into the current water heater, goes out the drain at the bottom like some other threads recommend. there's a check valve allowing flow from the sidewalk line back to here, but not out to that line. Also a drain to remove any air, there also won't be hot water here, preventing scalding.
From here goes to a pump to the hwc, then have a pressure relief valve, prv, which goes outside to prevent flooding if it blows. Also a Temperature gauge is here to know what the water temp, and pressure maybe?
Then it flows which goes to a junction which controls either out to the sidewalk line or the water tank. To keep it from the tank, close that, or vice versa. Then there would be a check valve after the tank entry valve to allow water into the tank, but not back to the outside line.
If water goes through the outside to de ice, there is a gauge to decide if it would need to be reheated or go into the water storage tanks, if it needs to reheat it would go back to before the first pump, via a check valve and repeat the circuit. If it would go into the tank, then it would enter after the valve blocking entry at the junction.
I'd put a PRV between the tanks as well and connect to the PVR line to the outside so there is no flooding there as well.
after entering the second tank, our current water heater hot/cold outs would feed the water filter and the rest of the house. I think there should be a temp/pressure gauge here to prevent damage to the current system.
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