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No, not that, and i removed the restrictor before I fitted it.

Do you mean remove the Grohe bar thermostat mixer and look at the H&C inlets? We do have very hard water.

It's an old Vailant Turbomax.

I've modified the head by breaking of the little rubber nipples that create each individual jet. Much more water flows and it seems better, but the jets have no oomph. Guess I need something between what I had and what I broke.

The flow rate through my shower is a bit low, resulting in the boiler cutting out from time to time. The shower doesn't have a restrictor, but I wondered about trying to find a high flow shower head. Do they exist, will it work? (Boiler had diverter replaced, taps produce hot water fine, it's...

I guess an alternative is to source a transformer of the right output that can be hard wired.

Thanks both. The connections would ideally be hidden in the ceiling space so no danger of inadvertent usage. But I need to check for heat dissipation.

Is there a regs compliant way to power a wifi mesh unit from the lighting circuit? The devices have a plug in adapter so it would involve a socket rather than wiring it in like a bathroom extractor, does that make it break the rules?

Vaillant VUW282e, much loved old faithful. Changed diverter valve. Found the diaphragm had a hole and was very perished so should be golden. All looks good but when filling boiler, water dripping from lower pump union. It's an o-ring seal, and I didn't have a new one (diverter didn't come with...

After being told there are no supply issues, a card cane thru the letter box informing us the they will be mending a supply pipe in our street today. Guess we'll see whether that's the problem. Makes me think their support person was fobbing me off.

Solid advice, thank you! I'm going to call them rather than DM on Twitter.

I'm going to keep pushing, I don't think "no supply probs in your area" is sufficient!

So, Thames Water maintain they have no supply problems in my area and it must be my internal plumbing. Are they obliged to come if I insist?

Great will do. I assume I should be asking them what the dynamic pressure is.

Ok, so I need a gauge for the first, what do I need to ask the water co to do? Thanks for all the advice, I would have spentv250 on that booster.

Oh crap! What's the answer then? Do I need a pump further up the house?

But I only get 8l/m on the hot side, so wouldn't a booster pump kick in when the hot is running?

Further measurements... Maybe pressure a little higher this morning. Cold flow ground floor next to boiler (16.5deg)12.5l/m Hot flow set to min temp (42deg) 8.8l/m Hot set to max (51deg) 8.2l/m Flow rate is much lower upstairs, and thus the water gets hotter. Boiler is 24kW ( old reliable...

Thanks, I will do some measurements. Does it make a difference if the hot flow is measured after it gets to temperature? Previously I didn't do that, so cold water was coming from the hot tap during the time it took to fill a litre jug.

The manual (to the extent I understand it) says it can supply DHW at 10l/m. The fact it's giving 7.7l/m out of the same tap that has a cold output of 11.2l/m suggests at least part of this is boiler-related, notwithstanding that there will be lower pressure at the top of the house. What I don't...