ᐅ Multi-day Power Outage as Currently Experienced in Berlin: Risks for Heating Systems and Water Pipes?
Created on: 6 Jan 2026 10:01
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Pianist
Good day!
As you probably know from the news, there is currently an extended power outage in the southern part of Berlin, which started on Saturday and is expected to last until Thursday. This makes me wonder: what impact does a multi-day power outage have on building systems when outside temperatures are below freezing?
Let’s assume that a house in an unprepared state would no longer be habitable by usual standards. The fresh water system can be drained, and the local water supplier can be asked to shut off the supply line in the street. This should take care of that aspect. But what about the circulation water in the heating system? It’s unlikely that every radiator or underfloor heating loop can be completely drained reliably.
How long does it take for a well-insulated house, constructed with materials that have good thermal mass, to freeze enough that there is a risk of heating pipes bursting? The consequences would be severe, potentially requiring the removal of the screed…
So, let’s assume minus ten degrees Celsius (14°F) and a week without power. Are there any experience reports from previous events?
Matthias
As you probably know from the news, there is currently an extended power outage in the southern part of Berlin, which started on Saturday and is expected to last until Thursday. This makes me wonder: what impact does a multi-day power outage have on building systems when outside temperatures are below freezing?
Let’s assume that a house in an unprepared state would no longer be habitable by usual standards. The fresh water system can be drained, and the local water supplier can be asked to shut off the supply line in the street. This should take care of that aspect. But what about the circulation water in the heating system? It’s unlikely that every radiator or underfloor heating loop can be completely drained reliably.
How long does it take for a well-insulated house, constructed with materials that have good thermal mass, to freeze enough that there is a risk of heating pipes bursting? The consequences would be severe, potentially requiring the removal of the screed…
So, let’s assume minus ten degrees Celsius (14°F) and a week without power. Are there any experience reports from previous events?
Matthias
But where do you connect the generator? How does the power enter the house without having to leave a door or window slightly open? Actually, it would be quite simple: I have a platform with two exterior stairs in front of the main entrance. Below it, you could install a male CEE32 socket, and inside a female one. That way, you would have a feed-in point. Inside, there would be a temporary power distribution board, and the heating system can be easily powered by opening the emergency switch and connecting the supply line to the heating circuit. Additional loads can then be connected as you wish.
Outside, use a diesel generator, preferably running on HVO 100.
Outside, use a diesel generator, preferably running on HVO 100.
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wiltshire7 Jan 2026 09:59Pianist schrieb:
So let's assume minus ten degrees and a week without power. Are there any experiences from previous events? Recently in our drinking water supply area: residents were not home, heating was off, the water pipe in the basement burst before the meter, basement flooded. The situation was worsened by the location being far below the water storage tank. Within a few hours, water from there had reached the basement of the house. Around the same time, a call came from the upper parts of the village reporting that water pressure was dropping, and another call from neighbors saying water was flowing from the basement into the yard. Because there was a smell of oil and visible streaks, the fire department was also involved.
Pianist schrieb:
In my opinion, there are only two options: either a fully reliable backup power supply to maintain normal operation or you leave the house and only try to prevent frost damage. We have a different solution: we don’t need electricity for heating.
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Oberhäslich7 Jan 2026 10:00Our garage with bungalow is uninsulated and without heating. It also has old wooden windows and door/gate that let in a significant draft. There are also two ventilation holes in the wall. Even with below-freezing temperatures outside, the interior temperature was always at least 0 degrees Celsius (32 degrees Fahrenheit). Therefore, I believe that geothermal heat alone is more than sufficient to keep a house between 3 and 8 degrees Celsius (37 and 46 degrees Fahrenheit) without damage for 1 to 2 weeks.
Additionally, simply running water through the pipes daily should also help prevent freezing.
Additionally, simply running water through the pipes daily should also help prevent freezing.
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Oberhäslich7 Jan 2026 10:07Basically, the risk of power outages in Germany is practically nonexistent. Wanting to protect yourself against this probably fits the typical German precautionary mindset (German Angst). Otherwise, you can easily counteract this with simple measures such as draining or flushing pipes, and setting up heat sources in the house that do not require electricity (hot water, small generator).
Oberhäslich schrieb:
Basically, the risk of power outages in Germany is practically nonexistent. Technically, that is true. However, my political assessment differs. Terrorists are extremely well-informed and know how to cause maximum damage with minimal effort. This problem is likely to increase rather than decrease.
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nordanney7 Jan 2026 10:40Pianist schrieb:
But my political assessment is different.Yep. That’s what the preppers always say.Similar topics