Water pressure in kitchen decreases, and only 10-15 minutes of hot water in shower before going lukewarm

[OurFreeSociety]

Pressure issue possible blockage of mains supply. Assume you have 10 bar mains supply pressure when there is no flow. Initially water will be delivered at high pressure until the blockage in the plumbing destroys the mains pressure so you have a trickle coming through

Crimped pipe ( like a hose that is doubled up) will cause similar problem

The white stuff you talk about, may well be blocking the faucets or gauze filters and shower sprays

Sorry for the delay in responding.

I sort of understood what you said in your first paragraph.

The white stuff was cleaned out the 3rd time he was here. He removed the kitchen faucet head & shower head & banged all that gunk out & things got worse after that, but I think the hot water issue had already started to occur which is why I had him come back & why he thought banging out out of those 2 heads would solve the problem, but it never did.

That still doesn't explain why the powder room bathroom faucet needs to be turned more to the left to get hot water. If I point it where I always pointed it before, it's barely lukewarm. But I guess you are saying it is that crimp.

I'll try to find another plumber to fix that crimp. I just want them to be able to SEE IT before they say they know the problem so I can feel comfortable that they know what they are doing, but they can't. Attention to detail is definitely NOT their strong suit.

As I mentioned above, I think this potential new plumber is just trying to scam me & the landlord, & when he realized there's a Mexican involved, not just the gringa he no longer wants to talk to me.

So much for me thinking he figured it all out.

Thanks a ton.

 

[DP]

As a comparable, gas flowing in copper pipe coats the inner surface with black deposit which then detaches in flake form to cause blockages. Often the flake will collect at the gauze filter on the inlet of the gas valve. When the gas valve is closed, test pressure is good. When gas valve opens, loss of pressure is clearly seen on manometer

Similarly, wet central heating and plastic pipes. Magnetite in the pipes will coat the inner surface of a plastic pipe to then delaminate and move down stream as if pipe contains tea leaves causing blockages.

Possible move for your scenario. At various points get the plumber to install test points where pressure reading can be obtained when offending taps are run

 

[OurFreeSociety]

As a comparable, gas flowing in copper pipe coats the inner surface with black deposit which then detaches in flake form to cause blockages. Often the flake will collect at the gauze filter on the inlet of the gas valve. When the gas valve is closed, test pressure is good. When gas valve opens, loss of pressure is clearly seen on manometer

Similarly, wet central heating and plastic pipes. Magnetite in the pipes will coat the inner surface of a plastic pipe to then delaminate and move down stream as if pipe contains tea leaves causing blockages.

Possible move for your scenario. At various points get the plumber to install test points where pressure reading can be obtained when offending taps are run

Not sure they even know how to test.

I'm still looking for a plumber.

The one who was either BSing or was saying something no one here figured out just ignored me when I said you should probably come look at the boiler. sigh

No one else knows of any plumbers.

Thanks a ton again.