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Thanks all for the help. I think its time to find a new plumber that knows about these cylinders.

Hi gasbanni Thanks for the info. I guess you mean the strainer on the cylinder not the shower valve. There is an adjustable PRV, http://www.oso-hotwater.co.uk/uk/pdf/20_series_SpareParts.pdf Mine has the pressure set to 5 bar at the moment. I am sure in the past, before a previous plumber, it...

What bit in the shower valve is likely to have failed? Its a grohetherm 3000, 34968. There is no leak etc from the shower head. Thanks

Hi Norcon / anyone I went to check the pressure in the expansion tank. Turned off the cold inlet and opened the hot tap in the kitchen. Initially got hot water and then it went cold and continued to flow at low pressure and didn't stop! I had a good think about your advice and went round the...

Thanks, thats what I thought you meant. Thats what is set to 5 bar. Its the adjustable version. (510511 multiblock) I guess this pressure needs reducing but I cant figure out how to do it.

The cold incoming PRV is set at 3 bar. What do you mean by icg please.

There is no balanced cold water connection on the cylinder. The showers are thermostatic. Can't think of anywhere else that hot and cold may meet. If the PRV is set on 5bar could this account for the 10-15secs of initial high pressure that drops to mains (reduced to 3 bar)?

Apologies. Its the green dial version and its probably set on 5. There is no 0 on the dial. In that case, is this allowing an initial 5bar pressure which drops to 3 bar as the mains prv only allows cold water at 3 bar? Can I adjust this valve? how does it adjust if so? Thanks

thanks

Thanks So pressure could get from the hot side to cold through a shower etc. We have grohetherm 3000's x 4.

Thank you. The PRV on the cylinder is adjustable (somehow) but seems to be set to zero. I seem to remember it used to be on about 2. The expansion tank is a 24l tank (white) cylinder is 210l. Mains pressure is 4-5 bar. Is that the standing pressure in the cylinder or does that need to be...

I'm having strange problems with an OSO 20 hot water tank. We recently had the TPR valve and expansion valves changed for water loss from the tundish. Then we had an external expansion tank fitted as the hot water was initially flowing at extremely high pressure and temp and unstable. This was...

Their 25-60 is not quite the right pump. The alpha's modulate flow. I am very happy with the alpha2 L , price was as good as I could find anywhere and I needed it quickly. Its also very energy efficient.

Hi No, bought an alpha2 L 15-60 from the local supplier for £88 + vat. Its been fitted today. Same inlet/outlet, direct swap. Looks to be working fine.

Thanks John, hope thats all it is. I read something about a tank at the back of the boiler that is prone to leak and not cheap to fix!

Having boiler trouble. The boiler was serviced last week. It had been working fine. Following the service the pressure dropped to sub 1 bar. I topped this up and it dropped again. Water was leaking out of the external pipe. I called the plumber who said it was the pressure relief valve. Thats...

House is in the UK, just can't find the 25-60 pump in the UK!

Further to that the UK alpha2 L 15-60 is actually a 1.5" connection so should be a direct swap.

Hi The existing alpha pump is 130mm not 180. The threads look 1.5" and its 22mm pipework. I really want to get a replacement that doesn't need new pipework. Its all hefty brass stuff to the manifold and would need replacement sections. The new alpha2 L is 199 Euro in France. I would just go...

I now see the problem, I had overlooked this. There is a Grundfos alpha2 L 25-60 pump (130mm). I have seen this on european sites so far. Will the alpha 2 L 25-60 be a direct replacement for my alpha 25-60? Thanks