Frost protection at the water connection

Frost is a big problem with water connections. If the water freezes in the pipes, it expands, damaging the pipe or fittings. In particularly unfavorable cases, pipe breaks are often the result. What should be considered in terms of frost protection of water connections, you can read here.

Outdoor water connections

The biggest problem with frost certainly has outdoor water connections, such as a water tap for garden irrigation installed on the outside of the house. If the first frost threatens, then measures must be taken to prevent the freezing of the pipe.

First, the water supply must be closed with the gate valve for the respective tap. Then the faucet can be opened on the outside. With the drain cock on the inside can then be drained of the remaining water. If this is not possible, an existing return valve may still have to be opened - only then does water flow out of the drain tap. The faucet is now pressure-free and empty, and freezing of the pipe is no longer possible.

If there is no shut-off valve on the inside, it is a self-draining tap. Here you need not worry about frost, the line protects itself from frost damage.

When new construction can be set from the outset on frost-resistant outdoor fittings. In this way, water can still be tapped outside in winter, and there is no need to shut off before the first frost.

Other endangered areas

Particular care should be taken when using other types of cables. Frequently overlooked are the solar system lines, which may also be exposed to frost, and must be protected accordingly.

With open connections on construction sites, protection with textiles or insulating materials is usually just sufficient, but the temperatures remain in the low minus range for a longer period, but must be heated as much as possible.

Avoid pipe breaks in the house

Especially with older, poorly insulated houses, it may happen that unfavorably located near the outer wall tubes freeze and then burst. This happens especially if the building is not heated enough due to absence.

The trade associations warn against using only the "frost guard" function for heaters: in many cases, the heating power is insufficient to reliably prevent freezing. In any case, a higher temperature should be chosen to ensure sufficient heating capacity.


After a court ruling a few years ago, the owner of a building is required to heat the building sufficiently and control it sufficiently often. A married couple had also relied on the frost guard function of the heater in their absence. The heater took damage in a frosty phase and eventually failed completely. This was then a water pipe break. The court gave the insurance right, which then did not have to pay.

Also for tenants, it is one of the obligations contained in the lease, to ensure adequate frost protection of the lines - otherwise they are guilty of a breach of duty.

Video Board: Frost Protection of Site Cabin Water Supply, MCWS Frost Protection Heat Tracing