Trying to get Hot Water in my shower
Discussion
As it's getting worse it's time to sort it.
Loft bathroom. Wash basin and thermostatic control shower. Similar setup on first floor and it's all fine. Megaflow hot water system
Loft. Turn on basin tap (monoblock) and move to hot and all you get is cold water. Turn on shower cold and you then get hot water at basin. You can then turn off the shower and hot water will continue at the basin.
Until recently the only way to get hot water in the Shower was to turn basin cold on fully. Water would be warm but not hot but this didn't worry me as don't like too hot.
Recently however it changed, you now also have to flush toilet to get hot water in shower and as soon as cistern fills the water in the shower goes cold.
I was previously told the problem was the one way valve in the shower. Someone else tells me the thermostatic cartridge in the shower is knackered.
One way valve means removing tiles. Thermostatic cartridge is fully accessible.
Anyone offer advice on possible cause?
Loft bathroom. Wash basin and thermostatic control shower. Similar setup on first floor and it's all fine. Megaflow hot water system
Loft. Turn on basin tap (monoblock) and move to hot and all you get is cold water. Turn on shower cold and you then get hot water at basin. You can then turn off the shower and hot water will continue at the basin.
Until recently the only way to get hot water in the Shower was to turn basin cold on fully. Water would be warm but not hot but this didn't worry me as don't like too hot.
Recently however it changed, you now also have to flush toilet to get hot water in shower and as soon as cistern fills the water in the shower goes cold.
I was previously told the problem was the one way valve in the shower. Someone else tells me the thermostatic cartridge in the shower is knackered.
One way valve means removing tiles. Thermostatic cartridge is fully accessible.
Anyone offer advice on possible cause?
I’m betting or cold mains pressure being greater than your mega flow hot water (which of course makes no sense), I wonder if you’ve got a PRV somewhere that’s failing. Hint being either tap or loo flush reduces cold pressure and allows hot through (or the one way valve is fubar’ed)
Jim
Jim
Might be worth replacing the cartridge on the shower yourself at least cost option (or if no replacement is available soaking it in vinegar or similar overnight)
I’m thinking it’s possible the hot water side of the catridge has scaled up, meaning hot water is more restricted, and then as mentioned above the cold water is not balanced with the hot.
If you have isolators on the hot it might be worth changing them for full bore (and they may have a problem / blockage too). If you have a isolators on the cold it might be worth closing it partially to see if the problem goes away
I’m thinking it’s possible the hot water side of the catridge has scaled up, meaning hot water is more restricted, and then as mentioned above the cold water is not balanced with the hot.
If you have isolators on the hot it might be worth changing them for full bore (and they may have a problem / blockage too). If you have a isolators on the cold it might be worth closing it partially to see if the problem goes away
Happy Jim said:
I’m betting or cold mains pressure being greater than your mega flow hot water (which of course makes no sense), I wonder if you’ve got a PRV somewhere that’s failing. Hint being either tap or loo flush reduces cold pressure and allows hot through (or the one way valve is fubar’ed)
Jim
Or following the same principle is there a temperature control valve on the megaflow outlet to limit the temperature to basins etc. that could be sticking.Jim
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