Draining Plumbing in a Vacant House
If your house is to be vacated during cold weather
and the heating system turned off, follow this procedure:
Shut off the water supply at the main shut-off valve
at the street. Then beginning with those on the top floor, open all faucets
and leave them open. When water stops running from these faucets, open
the cap on the main shut off valve in the basement and drain the remaining
water into a pail or tub. Remember that this cap must be closed after
the faucets have run dry or the house water supply will flow from this
valve and flood the basement.
Remove all water in the traps under sinks, water closets,
bathtubs, and lavatories by opening the clean out plugs at the bottom
of traps and draining them into a pail. If no plugs are provided, use
a force pump or other method to siphon the water out. Sponge all the water
out of the water closet bowl. Clean out all water in the flush tank.
Fill all traps with a non-freezing solution such as
mineral oil, windshield washing fluid or RV type anti-freeze.
Drain all hot water tanks. Most water tanks are equipped
with a vented tube at the top which lets air in and allows the water to
drain out the faucet at the bottom. Make sure all horizontal pipes drain
properly. Air pressure will get rid of trapped water in these pipes, but
occasionally the piping may have to be disconnected and drained. To be
safe have your plumber check your entire plumbing system.
If your house is heated by hot water or steam, drain
the heating pipes and boiler before leaving. Burners and pilots should
be completely out and the main water supply turned off at the basement
wall or street. Draw off the water from the boiler by opening the draw-off
valve at the lowest point in the system.
Open the water supply valve to the boiler so no water
will be trapped above it. If you have a hot water system, begin with the
highest radiators and open the air valve on each as fast as the water
lowers. Every radiator valve must be opened on a one inch pipe system
to release condensation.
Note: When you return home, refill all the
systems BEFORE lighting the hot water heater or boilers.