What is a Pipe Burst?

A genuine break is rarer than the name suggests. In one GDV analysis, an actual pipe break caused only 21% of pipe water claims; around a quarter came from faulty joints and broken or wrong seals. Typical triggers:

• Corrosion – galvanised steel and older copper pipes weaken from the inside over the years. According to the GDV, pipe water claims peak when an installation is 40 to 45 years old.
• Joints and seals – fittings, threaded connections and braided hoses on taps and appliances.
• Frost – freezing water expands and splits the pipe. Outdoor taps, garages and unheated basement rooms are the usual suspects.
• Installation errors – incompatible materials, badly crimped fittings, pipes hit while drilling.
• Constantly high pressure – a faulty or missing pressure reducer strains every joint in the house.

The amount depends on the line pressure and the size of the opening. A rough calculation with the orifice flow formula shows the order of magnitude: a 1 mm hole at about 3 bar household pressure can release around 1,000 litres a day. A torn supply hose on a washing machine delivers in minutes what a dripping fitting loses in weeks.

Small leaks are the treacherous ones: the water soaks into screed, insulation and masonry before a stain shows anywhere. In the basement it collects at the lowest point – on the floor, in a floor drain or, if there is a path to it, in the pump sump.

1. Shut off the water. Close the main stop valve – usually right next to the water meter in the basement or utility room. Find it today, not during an emergency.
2. Mind the electricity. If water is near sockets, distribution boards or appliances, switch off the affected circuit at the fuse box. Do not enter a flooded room where current could be flowing.
3. Document. Photos and videos of the leak, the water level and damaged items before you clear up.
4. Notify your insurer. Report the damage promptly and ask before you throw damaged items away.
5. Call the professionals. A plumber for the pipe; if screed or walls are soaked, also a specialist for leak detection and technical drying.
6. Dry out. Remove water, ventilate, run a dehumidifier. The US Environmental Protection Agency (EPA) recommends drying water-damaged areas within 24 to 48 hours to prevent mould.

• Water meter test: close every tap, run no appliances, note the meter reading and check again after one or two hours. If it has moved, the system is losing water somewhere.
• Main stop valve: close and reopen it now and then so it does not seize when you need it.
• Hoses on the washing machine and dishwasher: check for cracks and kinks; close the appliance valves when you are away for longer.
• Frost protection: according to the GDV, frost causes around 25,000 insured pipe claims a year on average, with roughly €140 million in damage. Shut off and drain pipes in unheated rooms and outdoor taps before winter, insulate exposed pipes and keep rarely used rooms heated throughout. The frost setting on a radiator valve, the GDV notes, only protects the radiator itself.
• Old installation: if the drinking water installation is 40 years old or more, have a plumber inspect it – ideally before you renovate a bathroom or floor.
• Automatic leak protection: devices installed after the water meter shut off the supply on unusual flow and stop a pipe burst even when nobody is home.

A pipe burst is a classic case of pipe water damage. In Germany, damage to the building – pipe, screed, walls – is covered by residential building insurance (Wohngebäudeversicherung), damaged furniture and appliances by contents insurance (Hausratversicherung). According to the consumer advice centre (Verbraucherzentrale), frost-related pipe bursts inside and outside the building are usually included.

You do not need natural hazard insurance for this; that covers heavy rain, flooding and sewer backflow. Conversely, pipe water cover does not pay when rainwater runs into the basement or groundwater pushes through the wall.

Check the obligations in your policy: if you leave a building unheated in winter or fail to drain pipes in empty rooms, the insurer may reduce its payout. The exact duties are in your policy terms.

Drainbee measures the water level in a pump sump or collection shaft. It only notices a pipe burst if the escaping water runs there – for example through a floor drain that discharges into the shaft. Then the level rises unusually, the pump starts more often, and you get an alarm once your threshold is reached.

Drainbee does not detect a leak inside a wall, under the screed or upstairs, nor water standing on the basement floor. That is what floor-level water leak detectors and automatic leak-protection valves are for.