So although my dwelling won't be passiv hauus standard I'm trying to ensure very little heat escapes into the attic space. Now I'm learning my water pressure is not good enough to run without a cold water tank in the attic. In previous older houses I've seen well lagged cold water tanks be located central in the attic space and have minimal insulation underneath them so some house heat escapes to keep the tank above freezing.   Whats the work around for super insulated air tight d