Pre-heat
Home Depot- Well tank 19 gal $150 Drip pan $19 (4) Ball valves $40 Cpvc pipe and fittings $100. ( I would use "Pex" pipe & "shark bite" fittings instead of cpvc if legal and available in Fl.) Cut the cold water line to heater and run water up in attic to the "bottom" of holding tank (put drip pan under tank). Take the top fitting of tank and return to "cold" on heater. Install 2 "stop & wastes" valves (little drain caps) on each side of holding tank. Intall a "by-pass" line and valve to use if you needed to islolate the holding tank. 19 gal of water would sit in attic heating to attic temp, ready to go in the "cold" fill of water heater. I have done this in De using basement temp (winter water temp is about 45 degrees). Cut my cost by 30 %.
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