Said It Here

How to blow out water lines and winterize an empty house

Winterizing an empty house requires finding the right fitting to blow out the water lines and figuring out unlabeled valves so pipes do not freeze. Without clear diagrams or proper connections, draining down systems like sprinklers becomes a guessing game that risks costly damage during freezing weather.

Overview
People affected11 accounts across 3 forums
Workarounds found23 items attempted
Community agreement39 total upvotes

What the numbers show

Counted from the threads quoted below. How we count

  • People have been saying this in most months since September 2026.
  • This comes up 11.8× more often in r/Plumbing than across the site as a whole.

What people tried

Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.

23 items+ Contribute

Found another way around this?

Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.

  1. 1
    Turning off one of the meter valves to shut off the entire house
    Did this help you?
  2. 2
    Having the city shut off the water at the street
    Did this help you?
  3. 3
    Using a compressor to blow out water from the sprinkler system and filling with antifreeze
    Did this help you?
  4. 4
    Attaching a small hose to drain the system to a floor drain
    Did this help you?
  5. 5
    Shutting off the main water supply while leaving the boiler powered on and the thermostat set to a lower temperature.
    Did this help you?
  6. 6
    Using smart or wifi-enabled thermometers to remotely monitor indoor temperatures while away.
    Did this help you?
  7. 7
    Checking expansion tank pressure before leaving.
    Did this help you?
  8. 8
    Pouring or running water down the fixtures occasionally
    Did this help you?
  9. 9
    Turning off supply stops under sinks and behind toilets
    Did this help you?
  10. 10
    Using specialized antifreeze for drains in shutdown homes
    Did this help you?
  11. 11
    leaving the main water valve turned on
    Did this help you?
  12. 12
    shutting off as many valves as able
    Did this help you?
  13. 13
    Opening the hose bib or tub/shower valve and flushing a toilet to introduce air
    Did this help you?
  14. 14
    Hooking an air compressor to the outside hose bib to blow air backwards at low pressure
    Did this help you?
  15. 15
    Keeping the heat above 50°
    Did this help you?
  16. 16
    Turning off the water main and opening all faucets
    Did this help you?
  17. 17
    Draining the hot water heater and toilets
    Did this help you?
  18. 18
    Pouring antifreeze into P-traps and toilet bowls to prevent evaporation and freezing
    Did this help you?
  19. 19
    Blowing out the water lines with an air compressor
    Did this help you?
  20. 20
    Paying someone to do a weekly inspection of the property
    Did this help you?
  21. 21
    Setting the water heater to vacation mode to maintain a low temperature
    Did this help you?
  22. 22
    Turning the water heater off completely and relighting the pilot when returning
    Did this help you?
  23. 23
    Leaving the water heater alone as long as the hot water tank remains full
    Did this help you?
Tried another approach not listed above?+ Share your workaround ↑

In their words

Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.

r/HomeMaintenance2 people · September 2026 – November 2026

“I need to winterize a house that is for sale. But sitting vacant. I don't live close by so it's hard for me to keep an eye on the house.”source ↗

“I plan on keeping the heat on, but I worry about an unintended water leak, causing extensive damage.”source ↗

“If I shut off the water at the meter to relieve pressure on the pipes and leave the gas and electricity on to keep the pipes from freezing will I cause any problems for the gas hot water heater?”source ↗

Low_Search_6667 · r/HomeMaintenance · 7 upvotes

“The problem is I'm having a hard time figuring out the diagram between which valve is A and which is B. They're not labeled and with it getting colder I don't want to leave it and have the pipes freeze.”source ↗

Saiyaaru · r/HomeMaintenance · 1 upvotes

“I'm trying to drain down and turn off the sprinkler system to be more accurate”source ↗

Saiyaaru · r/HomeMaintenance · 1 upvotes
r/homeowners3 people · September 2026 – November 2026

“I need to winterize a house that is for sale but sitting vacant. I don't live close by so it's hard for me to keep an eye on the house.”source ↗

“I worry about an unintended water leak, causing extensive damage.”source ↗

“If I shut off the water at the meter to relieve pressure on the pipes and leave the gas and electricity on to keep the pipes from freezing will I cause any problems for the gas hot water heater?”source ↗

Low_Search_6667 · r/homeowners · 7 upvotes

“I turn off the water at the main almost every week as I travel for work.”source ↗

jeweynougat · r/homeowners · 5 upvotes

“I just realized that shutting the water pressure off may not be great for the hydronic baseboard heating system.”source ↗

“If a leak happens, having water pump turned off is a big win. However, if the water pump being off causes the heat to stop working and the pipes to freeze then I'm only creating problems!”source ↗

_HeadlessBodyofAgnew · r/homeowners · 2 upvotes

“it's not the month of electricity I'm trying to save, it's the main water supply that I'm wanting to shutoff (by flipping my well pump breaker) to prevent a month's worth of water spewing into my house IF a leak were to occur when I'm gone.”source ↗

_HeadlessBodyofAgnew · r/homeowners · 1 upvotes
r/Plumbing7 people · September 2026 – October 2026

“So the reason you're hearing the flush suggestion is to "prime your trap" which means keeping water in your p traps. The reason for that is to make sure they don't run dry and allow sewer gases to work their way through unused fixtures.”source ↗

HemlocksCure · r/Plumbing · 4 upvotes

“When we go on vacation I always turn off the water and drain the system.”source ↗

“When we were leaving last week I couldn't drain the system as I've stated in the headline.”source ↗

Indyflick · r/Plumbing · 2 upvotes

“Just curious if anyone has any suggestions on the installation of a fitting that works best for blowing out the water lines when leaving the house empty for three months in the winter time???”source ↗

Leather-Bottle1402 · r/Plumbing · 1 upvotes

“I have a bathroom in my home that is not being use at all. I hear that even if it is not being use I should flush it once a week or so. my question here is, can I just shut off the water to it like the pipe under the sink and behind the toilet or flushing is the best practice.”source ↗

SeekerofSolution · r/Plumbing · 1 upvotes

“There's an antifreeze for drains that people put in shutdown homes that keeps the traps full without having to run water. As long as the toilet has water in the bowl its okay. The lav and tub are the problem.”source ↗

ArthurPeabody · r/Plumbing · 1 upvotes

“So, shall I turn off the water valve anyways and take a chance in case something gets overheated or just leave the main water valve turned on?”source ↗

Actual-Main5657 · r/Plumbing · 1 upvotes

“Thanks. But I should not worry about leaving the main water valve on and the risk of leakage or I should not worry about turning it off and overheating something? I’ll be gone for two weeks.”source ↗

Actual-Main5657 · r/Plumbing · 1 upvotes

“Should a water pipe burst or flood happen in your unit while you’re gone the damages may be incurred by you for not turning the valves off and not stopping the damages quicker”source ↗

Dangeroustrend · r/Plumbing · 1 upvotes

“I turned the water off a moment ago and went outside and opened the hose bib (no aerator) and it did the same thing.”source ↗

Indyflick · r/Plumbing · 1 upvotes

Where this came up

People with this problem also raised