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Right - hmm need to find this out somehow before I go a spending pennies ... Also, I now have me a 2 Bar pump which I paid £200 for about a year ago. Also, I have the boiler pump they too off. Any ideas on what they might be worth to flog, if anything?

I dont know if the Vailaint 837 is max flow restricted or what effect that has? I think its capacity is about 13l per min. Where would I get a pressure guage? The question is would changing shower from a Bristan bar shower to a Mira with a bigger flow throughput make any difference?

Nope - pretty much everyone measured the flow rate i.e. jug under tap. How do I measure the pressure then? It sounds like from what you are saying I aint gonna get it any better than it is? Was hoping to have it near the equivalent of the pumped version but currently it would seem to be...

Yes - have checked mains pressure and it is about 20 litres per minute. I'm told that is reasonably good pressure. Thats why I'm figuring I should be able to get the equivalent of the pumped shower I previously had. Trouble is I don't know what it is I need to change to do that i.e. shower...

Tibbot - I might be indeed. However, I have had a few around and have asked on this forum etc and by all accounts I was under the impression the important thing was the flow rate into the house. This is about 20 litres per minute. Now are you saying I can have better pressure with the same...

Well.... I done the deed and got me a Vailant 837 and done the flush. So far more than happy with the Central Heating side of it - all rads coming warming up nicely. Disappointed with the shower though. The pressure is less than we had with a 2 Bar pump before the Combi. It is just about...

aww .. gee ... fluff ..... it just aint gonna be the same around here without your problem!! Actually, most knowledge is gained from the time it takes to try, test, evaluate, try again etc. If everybody were able to fix a problem first time every time, there would be a lot less...

Fluff - no doubt your powers of persuasion are every bit in line with your ability to decipher the complexity of the problem :wink: And with that you will have the problem solved before 20 pages :lol:

Ben - this has been my dilemma. You see I get Homecare on a good deal at £11 per month or £132 per year - all parts, labour and service. Now a service is in the region of £60 which I would have to pay anyway. This means I am paying an additional £72 per year for the final three years and that...

Hey now fluff .. fancy meeting you on my thread!!! I must insist on your best behaviour in here girl .... no messing around on this thread - we get the business done. :lol:

Any offers on the question in my last post i.e. the difference between rads giving out 15.3kw and house heat loss being 13.5kw. For instance am I right in thinking the rads will only ever need to give what the house heat loss is - or are these two things totally separate??

When we moved here six years ago BG said we had sludge and it needed Poweflushing. At £600 - I said no thank you kind sir :lol: They still maintained the system and a few years ago changed loads of parts in the boiler as it was having a real wobble - or they did not diagnose it properly...

Jeeze I'm confused again.... what a shocker. When we talk about modulating down - do we mean it will modulate down to what the KW of the rads are which in this case is 15.3kw OR do we mean it will modulate down to what the heat loss is in the house which is 13.5kw. Put another way what is...

Hubby might be on to something here fluff ...catch him while hes hot .. so to speak!! :? From my very simplistic perspective, if there is sludge in the system then it needs shifting. It might not be the cause of your existing problem but it will probably be the cause of some future...

Well I think I have worked out the Kw of our 11 rads which comes to 15.3kw. Now if our existing boiler has a range of 14.65 to 17.59 then depending on what the installer set it at, it should be able to heat all rads eventually. Have I got this right? On the other hand, the new V831 will get...

True - though presumably it will be heating for the majority of it - particularly as there is no thermostat on the cylinder?? Not sure how I would work out the difference between the hot water being on for 3 hours versus 20 minutes usage on a combi.

Did a bit of further looking up. We have a Glowworm Ultimate 60ff. It says the Heat output min is 14.65kw and max is 17.59kw. Now if I am reading this right this means that it has to be below -1C for it to be working efficiently? On the other side it can only get up to 17.59kw max - is...

See answers above. Dont want to hog Fluffs thread with my issues - I dare not risk her wrath :roll: and I have a few threads on about it already. See ... //www.diynot.com/forums/viewtopic.php?t=237451

Ours is a lot more than 55 as there is no thermostat on the hot cylinder. When we have used the immersion it comes out near boiling!!! I understand the 937 has a storage amount to put out to taps instantly and the WB837 has a pre-heat system which operates similarly. However, there is a...