In This Guide
Winter plumbing care for vacant homes deserves special attention, because an empty house can go from fine to flooded with nobody around to notice. No showers running, no dishwasher cycling, no one opening a cabinet or hearing an odd drip. Stagnant water in pipes freezes faster, and a burst pipe can run for days before anyone discovers it.
Whether you own a vacation property, are between tenants, or are selling a Lynnwood home over winter, this guide gives you a complete plan to protect the plumbing while the house sits empty.
Why Vacant Homes Are Freeze Magnets
Occupied homes generate heat in dozens of small ways: cooking, showers, laundry, bodies moving through rooms. A vacant home has none of that. Thermostats get set low to save money, interior doors stay closed, and cold pockets form in bathrooms, laundry rooms, and additions. Water sitting motionless in pipes also freezes more readily than water that moves regularly.
The result is that pipes in a vacant home can freeze during a cold snap that would not trouble an occupied house at all. And when a pipe bursts with no one home, the water runs until someone happens to check, which can mean days of continuous flooding.
The Vacant Home Winter Plumbing Checklist
- Set the thermostat to at least 55 degrees. Do not turn the heat off to save money. Keep interior doors open so warm air circulates to every room with plumbing.
- Drain outdoor lines completely. Disconnect hoses, shut off interior valves to hose bibs, and drain irrigation lines.
- Insulate vulnerable pipes. Wrap exposed pipes in the crawl space, attic, and garage with foam insulation.
- Protect traps and toilets. Pour non-toxic antifreeze rated for plumbing into sink, tub, and floor-drain traps, and add some to toilet bowls to prevent the trap water from freezing and cracking the fixture.
- Service the water heater. If you keep it on, set it to vacation mode. If you drain the system, turn the heater off and drain the tank.
- Know the main shutoff. Make sure your property checker knows exactly where it is and that the valve works.
- Clear gutters and downspouts. Ice dams and overflowing gutters push water toward foundations and into walls.
Drain the System or Keep the Heat On?
| Approach | Pros | Cons |
|---|---|---|
| Keep heat on at 55+ degrees | Home stays protected; pipes, finishes, and appliances safe; easy to reopen | Heating costs continue; a furnace failure leaves pipes exposed |
| Shut off water and drain everything | No water to leak if something fails; lowest risk of flood damage | More work to winterize and reopen; traps and water heater need care |
For most Lynnwood homeowners, keeping the heat on with regular check-ins is the simpler path. Full drain-downs make sense for properties vacant all winter with no one nearby to check. Either way, never do a partial job: a half-drained system with heat off is the worst of both worlds.
Pro tip: a smart thermostat with temperature alerts can text you if the house drops below your set threshold. It is cheap insurance for a vacant property.
Monitoring a Vacant Home Through Winter
Arrange for a trusted person to walk through the property at least weekly during cold stretches. Their checklist: confirm the heat is running, look under sinks and around the water heater for moisture, check the basement or crawl space for standing water, and glance at ceilings for new stains. Water-sensing alarms placed near the water heater, washing machine hookups, and under sinks add an extra layer of protection and can alert a neighbor with an audible alarm.
Before winter sets in, consider a moisture intrusion inspection to catch existing dampness or vulnerable pipe runs while there is still time to fix them.
Reopening the Home in Spring
When winter ends, reopen the plumbing slowly. Turn the main valve on gradually and walk the house listening and watching for drips. Check every faucet, toilet, and appliance connection. Run water through all fixtures to refill traps and flush stagnant lines. Inspect the water heater area and the crawl space. If anything looks or smells off, our guide to spring thaw pipe checks walks through a full post-winter inspection.
Should You Drain the Water Heater?
For vacancies of a month or more, many homeowners shut off and drain the water heater. Turn off the gas or flip the breaker first, then connect a garden hose to the drain valve and empty the tank to a safe drain. This prevents tank corrosion from stagnant water and removes dozens of gallons that could flood the area if the tank fails while you are gone. For shorter absences, leaving the heater on its vacation or pilot setting is fine and uses minimal energy. Either way, shut off the cold water supply to the heater so a failed tank cannot refill and keep leaking.
Protecting Crawlspace and Outdoor Plumbing
Crawlspaces are the coldest part of most vacant homes. Close and seal the vents, insulate exposed supply lines with foam sleeves, and make sure the vapor barrier is intact. Outside, disconnect every hose, drain irrigation lines and backflow preventers, and shut off water to outbuildings. If the property has a well, ask your well technician about winter settings for the pressure tank and pump house. Walk the full perimeter one last time before you leave; the pipe you forget is always the one that freezes.
Vacant homes need a deliberate winter plan, not just a lowered thermostat. Work through the checklist above, arrange regular check-ins, and your empty property will make it to spring without a plumbing disaster. And if you ever need a professional set of eyes on hidden leaks, ProLine Leak Fix Pros is one call away at (425) 380-0028.
