This pipe runs from the cylinder into the cold water feed and expansion tank. But, if we see significant damage due to wear and tear or just old age, then we might suggest that you invest in a new hot water cylinder – financially, you’ll be far better off in the long run by ordering a replacement. A hot water cylinder has an overflow pipe that’s also known as an expansion or vent pipe. In some situations, a minor repair will greatly improve the performance of your system. As we’ve said before, we are hot water cylinder experts. If you have any concerns at all about your hot water cylinder, contact us and we’ll come to your place and sort things out for you. If the dripping continues, the valves are probably faulty and you need to contact us.If the dripping stops, this is normal thermal expansion.Turn off the power supply to the tank for five minutes.Here’s a simple test to determine what os going on: Bad Drain Valve If your drain valve is loose or broken then water will leak out. If tightening them does not stop the fixture from leaking, it may need to be replaced. The dripping relief pipe you’re noticing is probably experiencing normal thermal expansion, but it could also have a faulty valve. What Causes A Leaky Water Heater Loose Pipes Connections If any pipes connected to your water heater or valves are loose they may spring a leak. These days, however, cold water relief valves are installed to the inlet side of the hot water cylinder to save hot water. In instances where a secondary safety vacuum break was not fitted, the water cylinder has exploded, blowing roofs off houses and buildings moving on their foundations. ![]() In some cases, it has had disastrous consequences. They’re obviously unaware that it is perfectly normal. The relief valve is essential among valves and can protect water dripping through the joints. Improver setting or loose connection, any of them may occur during water leakage. During its passage, there are several joints and valves act. We know of some cases where these vent or relief pipes have been blocked off by people in an attempt to stop the dripping. The piping connections flow the hot water from the tank to the fixtures. That extra water has to go somewhere! Hot water cylinders are manufactured to relieve this expanded hot water through an open vent pipe on the roof, or via a relief valve and pipe to an outside wall or drain. ![]() When the water in your cylinder is heated from cold, the volume can increase by as much as 3% in a hot water cylinder with a capacity of 180 litres, that is as much as 5.4 litres. That’s what we mean by thermal expansion. Your cylinder is just doing what it is designed to do. But in most cases, it’s simply a case of normal thermal expansion and nothing to be concerned about. At first glance, any hot water cylinder overflow might be alarming when you first see it. As hot water cylinder experts dealing with installation, repair and service, we receive plenty of enquiries about overflowing cylinders.
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