Fresh water tank.......open drain valve and leave it open over winter. The few gallons will freeze but have room to expand inside tank
Black waste tank....can't dump....has some liquids in it....dump gallon of cheap anti-freeze down toilet. It will be diluted and probably will turn to slush over winter but it has room to expand inside tank.
Winterizing plumbing system.....
Don't want anti-freeze in fresh water tank cause it takes lots of flushing to get rid of it.
Don't want anti-freeze in water heater tank either
So 'winterizing kits' are available (install in suction line to fresh water pump, 3 way valve with a hose) turn valve 1/4 turn and it stops anything going down suction line into fresh water tank/opens valve to added hose......stick hose in bottle of anti-freeze. Turn on water pump to pump anti-freeze thru plumbing system--cold/hot water lines thru faucets/showers, toilet & low point drains.
Water heater bypass kits are also available so that water heater tank can be isolated and drained.
Cold inlet valve to WH tank closed.......Bypass valve Open (connects cold/hot lines on WH tank) and hot outlet closed (if you have a valve...otherwise the check valve in hot outlet is suppose to stop any backflow thru hot line into WH tank)
Winterizing kit.....
WH Tank Bypass.....
This is a 3 valve system
This is a 2 valve system ( Two 3 way valves....cold/bypass & hot/bypass)
This is a 2 valve system (cold inlet & Bypass---check valve in hot out)
This is 1 valve system (3 way cold/bypass with check valve in hot out)
Is it time for your medication or mine?
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