Hi webster2020 Most likely cause is that you have an airlock in the hot water supply pipe to this particular shower. Try removing the shower hose, turn the shower onto its hottest setting and turn on, this may clear the airlock. If this fails presumably you have isolating valves next to the shower valve, turn both off, remove the shower valve then turn the hot back on. This should clear any airlock. Regards S
There's a hot water tank on the top floor, but no cold water tank, so I'm assuming cold water is off of the mains.
The mixer bar worked for a week without any pressure problems, the one it replaced (also a hansgrohe) only had pressure problems at the end of it's life and the other hansgrohe shower (same model) in the shower room is next to the hot water tank. It doesn't have any problems.
I'm thinking it's either; as you said, an airlock problem, some sludge or a faulty thermostatic valve in the bar. Given it's a new unit, we'd have to be unlucky with a faulty thermostatic valve.
What I can't work out is why it worked for a week and then had problems.
Hi webster2020 I assume that the hot water only trickles out of the spout when the valve is set to tap mode. If this is the case then first thing is to check the filter which is fitted to the valve. Regards s
You’re correct the water was only trickling out when in tap mode and when the temp was high. The lower the temp went, the higher the pressure went. This was also the same experience when using the shower attachment, ie low pressure when hot, but pressure increases as you turn it to cold.
All other taps and showers in the house are still fine. The shower/tap was fine when first installed. The issue started a week after installation.
However, yesterday, for some bizarre reason the shower/tap started working normally again, ie pressure is inline with the other taps/showers in the house.
I am very perplexed by this and will continue to monitor, but it ties in with what you said about an airlock. I’m unsure though, why it would suddenly start and then suddenly stop.
It really depends where your source your water from. If you're on city water there's often a pressure regulator that can be adjusted with the right tool, likely requiring a plumber or your water utility to adjust.
If you have a well you've got more control over your pressure. Typically you'll have a pressure tank and an adjustable relay that cycles your pump on and off at certain pressures. You can adjust the pressure on the relay unit.
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