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Replacing stopcock, which size

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I'll have to get hold of my plumber as it was his recommendation I was going with on the cylinder.

Cheers for all the help. The intention was to get as much done prior to bringing him in around January time. Looks like I probably need more info before touching anything
 
So basically you've got 2 bathrooms, if so you should be able to supply to bathrooms with a combi boiler.
 
I've covered this with my plumber, I want the hot at mains pressure for a proper shower experience that a combi cannot provide. Unless the newer combis can provide that sort of pressure now to support an electronic power shower mixer?
 
1animal1 said:
I've covered this with my plumber, I want the hot at mains pressure for a proper shower experience that a combi cannot provide. Unless the newer combis can provide that sort of pressure now to support an electronic power shower mixer?
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A combi boiler is able to provide you a decent shower without lack of water pressure unless you open 2 showers in the same time then the boiler will provide you half. Which means if the boiler will give 16lpm you will only get 8lpm at the shower. Other than that there is no issues.
 
That's the biggest issue, the drop off when using any other mains hot water source.

I have considered both and obviously don't want to spend more than I need to, but the unvented seems to tick all the boxes.

The final system will be a 2 zone with hot water and respective nest control. That's what I've settled for and what I am halfway through piping for... Although a bit of a pita as I'm having to pipe as I want it in its final guise, but then link it all together to work now with the current set up... Bags of fun 🙂
 
Ok, I've ran the 6 second test at the kitchen tap which is about 10 meters from the stop tap, and again at garage mounted tap about 1 metre from the main. Both with and without an electric shower running. 13 LPM is what I can deduce... So I'm miles away!

Tried again with two toilets filling and it dropped to 11 LPM

Just about to order a pressure gauge to test pressure.

Guessing I'm screwed at that
 
1animal1 said:
Ok, I've ran the 6 second test at the kitchen tap which is about 10 meters from the stop tap, and again at garage mounted tap about 1 metre from the main. Both with and without an electric shower running. 13 LPM is what I can deduce... So I'm miles away!

Tried again with two toilets filling and it dropped to 11 LPM

Just about to order a pressure gauge to test pressure.

Guessing I'm screwed at that
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I have told you before you should testing the lpm and the pressure ( standing/operating ).

Doesn't look to good with what you have got
 
Do these other taps have ballafix valves?
Flexi pipes?
Other restrictions?
 
Yep, all taps and toilets have Flexi pipes and valves in place. I did try the garage tap which is actually less than a metre away and straight off the pipe... However less accurate as it takes a lot more turns to get full flow from it.

That gave me 14LPM
 
1animal1 said:
The pressure hasn't been measured properly, however it's not in question and my plumber agrees given what he has seen. It's easily above what is required for an unvented.
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Are you testing from the same place as this?
For a true reading take the pushfit bend off above the stop tap, put a piece of hose or pipe on and test from there.
The house may be full of hidden gems like the restrictive ballistic valve
 
This was from the kitchen tap....

Will do as you suggest, try without restrictions. I may try the garage one again with two buckets... Chuck one under for 10 seconds then remove....
 
Latest on the garage tap is 14 LPM running on full.

Would it not be useful to try a new stop tap on 22mm given that my 20mm is reduced to 15mm prior to the stop tap already?
 
Edit.... Just realised when looking at the picture at the start of my own thread, I fitted a ball valve and it was only half on!!! This is between the garage tap and the main.... Anyway, 2 tests... 26 and 30 LPM... Winner!!

Question for you chaps.... Just been talking to my neighbours who both have big combis running decent sized power shower heads, with no noticeable detriment when using another hot in the house.... I think my view on combis is based on a crap one in my old house that didn't pump very well and was notable when using a hot tap whilst having a shower.

I'm guessing combis have come on quite a bit!? Is it possible that a modern combi can run two power showers? And can I power two electronic valves for two central heating rings (2 nests) with a decent sized combi?
 
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Thanks Shaun. The unvented was going to be situated in the back corner of the garage, so I imagine it'd be similar footprint? This seems to be a halfway house.... What's the efficiency like compared to an average unvented? And is there a contingency should the combi stop working for hot water?

Yep, that's mine with the PTFE Scott. It's entirely hidden so didn't need to be neat 🙂
 
Apart from the lack of emersion and annual service, what's the downside compared to unvented?

Imagine the cost will be similar given the outlay for the unit (I had budgeted £3000-£3500 for the unvented).

And can I use with 2x CH rings with a potential underfloor add on..... And nest 🙂
 
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