Search results

You are a star!! I had to do quite a few turns on the slow cylinder PRV and then suddenly I heard some gurgling, felt the pipe go cold, and hot water flow started up... wow I cannot believe you managed to fix it. Thanks for this! Really appreciate it.

Yep, the tap is opened, have turned it a number of times - and it is currently open in the same position as the fast draining cylinder.

Unfortunately I don't have a tool to slacken that coupling nut as its really large, my spanners only go up to 22inch. Will try and test that out. It is remarkable though how the fast cylinder, even when not draining, has a cold to touch inlet pipe, versus this one is luke warm.

Yes this is the cold inlet isolator - it is the tap one - sorry I guess it is not called a red handhweel gate valve but it is a tap valve (I don't know the technical terms for each valve!)

So I followed your instructions - and assuming you mean turn the red PRV valve when you say "open the expansion valve" - only hot / warm water came out from the slow cylinder discharge. Is it possible the handwheel gate valve can be faulty? Up to the handwheel gate valve on the cold inlet pipe...

I lowered the temperature on the slow draining cylinder right down yesterday but it is still heating up, so in my view I think this confirms the diverter valve is on the hot return to the boiler, instead of the hot flow to the cylinder from the boiler. This means whenever the other cylinder is...

Yes I think thats the technical term a handwheel gate valve. Again this morning as I am working from home, I closed the handwheel cold inlet to the fast cylinder and closed the valves on the hot water outlet to zero - and I left both fully open on the slow cylinder - no hot water was produced...

So I can shut the cold water going into each cylinder with a turning type flow valve - but I don't know how to drain out the water from the slow cylinder

I've also noticed this Setter flow valve on the heating loop into the slow draining cylinder, not sure why it was installed and what it does exactly. From Google it seems to adjust the heating flow into the cylinder - but this isn't really an issue in the first place as the cylinder heats up fine.

I can discharge hot water from the slow cylinder, with either the red PRV from the cold loop going into the cylinder, or from the one which is connected to the hot water outlet from the cylinder - it discharges very hot water only. I would have thought the red PRV from the cold loop should only...

So the diverter valve is connected to the cylinder return to the boiler, rather than the flow into the cylinder. Not sure why it has been done that way. Noted re pumps, thanks.

Hi there, I've already posted on the forum but I need an experienced heating engineer to determine what changes to make to my system - please let me know if you can suggest anyone covering north west London (not far from Watford) who can deal with system design and complicated wiring. Thanks...

Basically I think one major problem having observed the boiler for a few days now is that throughout the day it is turning on an off for different circuits. With a 9kw minimum output, even just to heat for example a slight drawdown in hot water (because of secondary recirculation) or to heat up...

Also when I release water from the cold water inlet on the slow tank it feels warm to touch and is cold on the fast draining tank

So I looked again and yes there is a cold water pressure reducing valve on the slow tank of 3 bar and on the fast tank of 3.5 bar. There is also a pressure relief valve which discharges hot water on each tank. The interesting I just noticed is that from the cold water inlet tap upwards on the...

I will have a look at the expansion vessel when I get home and if I can measure the pressure using one of those tyre gauges will get one from Amazon, cheers. The gate valves are fully open yes, they have settings from 1 to 4 with intervals of 1 to 4 e.g. 1.1, 1.2, 1.3, 1.4, 2.1, 2.2 ...

Ok so as a novice help me out here please... so we have a pressure release valve and a pressure reducing valve. The pressure reducing valve in the diagram above is on the cold mains and is coming into the tank ... here I've noticed the sticker on one of the cold water PRVs says 3 bar and other...

The thing is the plumber installed these valves because of the flow issues - however they haven't made any difference since installation - if anything they have just highlighted that one cylinder is hardly draining as we suspected.

On the hot water outlet - I have put a picture a couple of posts above - thanks

Yeah it was a new gate valve that we installed maybe 3 years ago, so I don't think thats it but you never know