No hot water. 3 ladies in the house. I'm feeling the heat (but not from the water) | Bathroom Advice | Page 2 | Plumbers Forums

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Discuss No hot water. 3 ladies in the house. I'm feeling the heat (but not from the water) in the Bathroom Advice area at Plumbers Forums

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Here's the problem:
  • Central heating (wet underfloor) is fine.
  • Hot water comes out of any tap/shower for 60 seconds, then cold.
  • This happened suddenly, was working fine before that.
  • Boiler working OK.
  • Pipes within a couple of metres of unvented cylinder are hot.
  • Pressure gauge to cylinder is broken (so can't read input pressure)
  • Supplied by water main, good pressure in house generally.
My Theory:
  • Water is hot in the cylinder and therefore heats up water in the pipes gradually.
  • Whet tap turned, hot water in pipe comes through. This quickly runs off and only cold water follows.
  • So, the hot water in the tank is not being pushed through the pipes, it just stays in the tank.
Is that a good theory? And if so, what would cause this? Tried turning of mains input to cylinder, opened hot tsp til it stopped, twisted the tun dish for a bit, refilled and the closed the hot tap. Didn't fix it. I am thinking do I need to drain the cylinder completely via the drain valve at the bottom, then refill? Also, could it be the silver automatic valve causing the problem? I actually have two cylinders side by side so hard to see how both ports would fail at the same time?

Any help? The ladies will be home soon :(
 
Can't say due to it being a pain if the pipes are boxed in etc

You could do most of the donkey work eg finding the pipes making access etc
 

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