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sounds like a diverter valve.

I don't understand which bit I was wrong about. The OP is using a third party cylinder and his/her plumber is using it with external controls. Both of which I've mentioned? I appreciate you may be a registered Viessmann installer but the two points I made are valid. I also note you have been...

I usually go for 50mm either side.

I think your PCB will be different. The UK has a stupid regulation which requires an energized cut off on an unvented cylinder. In the USA and Canada, this is not required. A lot of the Viessmann machines that are sold into the UK have an energized cut off in them, I don't know about the...

This might sound controversial but I would go direct off the 22mm feed on the side of the tank (NOT THE TOP). If you get something with multiple port tappings then the idea is to stop the air entrainment, with an unvented cylinder 66% of the way up should be sufficient, if you've got a dip tube...

This really depends on how the cylinder and controls are wired up. Two options that I can think of, Viessmann Controls (System Boiler), The cylinder stat goes directly to the boiler control and it takes care of it. Considering the brand of cylinder, I don't think its wired like this. This...

If you are teeing where the isolator is then there is only one elbow on the left hand side tank, there are a few more on the right hand side. Roughly speaking (and there are various schools of thought), one elbow is about 0.3 to 0.5m of straight pipework. Water like most things will always take...

I think you'll draw off the one on the left much faster than the one on the right, especially if you put a massive pump on it. are they indirect cylinders? in which case how is the coil set up?

remeha avanta, sold in the UK and has an NRV - give them a ring and see what they say.

I would isolate elsewhere, rip out the two stopcocks you have and replace with a single unit. I doubt plumbers mait would hold a static pressure of 4 bar (if that is what your mains is).

you can undo them. Then rotate to the correct orientation and then tighten then. If you leave them "done up" and then manipulate the joint a lot, the seals will get damaged

In which case you must be worse than that.

Broetje and Junkers spring to mind.

It is not uncommon to see boilers with NRVs, not sure why everyone called me a tit when its pretty common on a variety of machines out there. Anyway to illustrate my point, the remeha avanta has one its on P49 of their manual.

from wikipedia: http://en.wikipedia.org/wiki/Regulation_and_licensure_in_engineering The title Chartered Engineer is protected by civil law. However unlike Canada and certain US states the practice of engineering is not protected in law nor the use of the title "Engineer". So anyone in...

I would keep your 3 bar pump and buy a larger shower head.

Just a word of warning to the original poster. If you go from a 3 bar to a 2 bar pump, you will not get a 33% reduction in force. The force you find uncomfortable is the speed at which the water pelts you. So if you dropped the pressure from 3bar to 2 bar, the velocity drop would only be...

the boiler is detecting a pressure drop on the DHW side (I know you said it was the cold) and then prompting a start. This is more likely to be the way the piping is set up rather than the boiler itself. Especially if all other functions are okay. There is usually an NRV (non return...

In large buildings, a pump is often used to send water to the top of the building, however there is often an air break and a separate tank so its not technically pumping mains. Personally I cannot see an issue with bolting a shower pump onto the mains provided you can get sufficient flow. If...

oh dear another nerve rattled. What I have said is true and I have also pointed out the legal implications of doing it. I couldn't help watching watchdog last night and see all you so called "engineers" giving the profession a bad name. And for info, you cannot become a chartered...