Preventing Frozen and Burst Water Pipes in Rental Housing — Complete Guide to Winter Water Problems in Cold Regions

What is Water Pipe Freezing — Winter Water Problems in Rental Housing

Water pipe freezing occurs when temperatures drop below freezing and water inside the pipes freezes, either causing no water to come out or, in the worst case, the pipe bursts and water sprays out. While this is an annual winter occurrence in cold regions like the Tohoku and Hokkaido areas, in recent years freezing damage has been increasing in the Kanto and Kansai regions due to record-breaking cold waves.

In rental housing, questions about "where the tenant's responsibility ends" and "who pays for repairs" come into play, making it important to have knowledge beforehand.

Locations and Times Most Prone to Freezing

Areas with High Freezing Risk

• •Exposed pipes on the exterior or exterior-facing walls: Areas that don't receive sunlight and are directly exposed to outdoor temperatures
• •North-facing water meter boxes: While buried underground, they can freeze during severe cold waves
• •Water heater piping: Particularly prone to freezing among water pipes
• •Washing machine faucets (on the north side or outdoors)
• •Pipes under the floor: In older properties with insufficient insulation, the area under the floor reaches temperatures close to outdoor temperatures

Weather Conditions Prone to Freezing

• •Minimum temperatures of -4°C or below
• •From windy winter nights into the following morning
• •Cold waves where temperatures don't rise over several days

Prevention Strategies for Freezing

① Keep a Small Amount of Water Running

This uses the property that moving water is less likely to freeze. Before bedtime or going out, let a small amount of water run from the faucet—just a thread-like trickle. While the water bill cost is minimal, this method significantly reduces the risk of freezing and bursting.

② Drain the Water (Water Bleed-Off)

For extended absences or severe cold waves, "draining the water" is the most reliable method. Closing the water shut-off valve and emptying the pipes of water prevents freezing.

Steps for Draining Water (General Example):

1. Close the water shut-off valve (turn clockwise)
2. Open the faucets and let all remaining water drain out
3. Leave all faucets open
4. When using water again, open the shut-off valve before closing the faucets

The location of the water shut-off valve varies by property. It's reassuring to confirm its location with the property management company or landlord at move-in.

③ Use the Water Heater's Freeze Protection Feature

Modern water heaters have a built-in freeze protection mode. If you keep the power in the "off" position without unplugging it, the freeze protection mode operates automatically. The golden rule is to never unplug the water heater's power cord, even during extended absences.

④ Protect Pipes with Insulation Material or Heat Tape

For exposed pipes outdoors, you can wrap them with insulation tape or electric heat tape. It's wise to consult the property management company and obtain permission before installation. Some properties may already have such measures in place.

Emergency Response When Freezing or Bursting Occurs

If Pipes Are Frozen and No Water Comes Out

1. Don't panic and pour hot water on it — Sudden temperature changes risk bursting the pipe
2. Use lukewarm water (around 40°C) or commercially available "thaw spray" and gently melt the ice
3. If using a hair dryer, use the "low to medium heat" setting and be careful about electrocution risk
4. Waiting for natural thawing is safest (the pipe will thaw as temperature rises)
5. After thawing, run water briefly to confirm it's working

If a Pipe Has Burst and Water Is Spraying

1. Immediately close the water shut-off valve (the valve on your water meter)
2. Immediately contact the property management company or landlord
3. Take photos if the floor or furnishings are wet
4. If water has entered electrical systems, turn off the circuit breaker

Cost Responsibility — Who Pays?

Cases Where the Tenant is Responsible

• •Neglecting to drain water during extended winter absences, causing freezing or bursting
• •Failing to follow the freeze prevention procedures outlined in the water heater manual
• •Ignoring instructions from the property management company (such as water draining obligations)

Cases Where the Landlord or Management Company is Responsible

• •The property's insulation is insufficient and freezing occurs even with normal living
• •Bursting caused by weakened aging pipes
• •The landlord has not taken freeze prevention measures

The distinction of cost responsibility varies depending on contract terms and circumstances. After a problem occurs, it's important to take photos and record when and under what conditions it happened.

Points to Confirm Before Moving In

• •Whether the property has a water shut-off valve and where it's located
• •How to use the water heater's freeze protection feature
• •Whether freezing or water problems have occurred in the past
• •The procedure for extended winter absences

Summary

Preventing frozen water pipes is far easier than dealing with them after they freeze. Especially when moving to a cold region, confirm the location and procedure for the water shut-off valve with the property management company right after moving in. In case of emergency, the top priority is to calmly close the main water shut-off valve. To prevent disputes over cost responsibility, it's reassuring to develop a habit of recording conditions as they occur.

This guide explains in detail how to prepare for natural disasters such as typhoons, heavy snow, and torrential rain in rental housing, including emergency procedures, how to contact your management company, and how to use insurance effectively.