I recently had a second leak happen in a water heater, it is currently disconnected from the house (we are on cold water only). We have a pex manifold system in the house, this is a new one because the original one developed a leak.
Rundown: original water heaters quit,
installed tankless water heater,
shut off water to the house,
turned it back on to discover the manifold had a crack from the
factory,
new manifold and tankless water heater put in,
tankless water heater developed leaks (in coils),
shut off water to the house,
waiting for parts so no hot water, turn water back on,
but also no cold water in showers, cold runs fine everwhere else
When I shut off the water to the water heater the first time – I had full pressure on the cold side, but now with the new manifold installed I have no cold water in the showers.
What could have happened?
Best Answer
Summarizing comments:
You have thermostatic mixing valves. They must have equal pressure incoming on both hot and cold feeds.
You solved by feeding cold water to box pipes while waiting for your hot water heater parts.