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  1. M

    Water pressure too high even after PRV

    It had me confused, but that's not difficult. As mentioned I chose to go with a Caleffi 535 and it's holding nicely.
  2. M

    Water pressure too high even after PRV

    I was recently going to fit a 15mm Predator (model PRED800015) ... the one they sell in Screwfix with the green top for about £35. It says in the Screwfix description that it's drop tight. But the tech dept say not. And the installer did apparently agree with them. Long story short - I rang...
  3. M

    I've provided a lovely new cold feed going exclusively to a new combi. A quick question.

    To be honest I've always thought unvented cylinders went hand in hand with System Boilers not gravity systems. The installer who was round here recently made that suggestion and he's a pretty switched on bloke. But, like I say, it's always been the de facto suggestion - or al least I thought it...
  4. M

    I've provided a lovely new cold feed going exclusively to a new combi. A quick question.

    Yes, of course you're right, Tony ... and if you went back a bit to my contributions from the past you'll see I gave (admittedly disproportionate) thought to that very thing. Intergas Heat Only was right up there as a choice. But it seems things have moved on with certain manufacturers and...
  5. M

    I've provided a lovely new cold feed going exclusively to a new combi. A quick question.

    But you'll have seen me saying the boiler's 28 years old, with an inefficient cast iron heat exchanger (or so I keep being told).... and a 28 year old plastic F and E and a 28 year old plastic CWST and a 28 year old HW cylinder.and ancillaries And everyone tells me that open vent is a dirty...
  6. M

    I've provided a lovely new cold feed going exclusively to a new combi. A quick question.

    I don't think I'm confusing myself. Read the parts I was referring to. I know full well that if a boiler design requires it be pressurised then it needs to be pressurised. Did you think I can't work that one out? I also know if a boiler (such as my Classic) is gravity fed then it runs on...
  7. M

    I've provided a lovely new cold feed going exclusively to a new combi. A quick question.

    I don't want an unvented cylinder. The present boiler is 28 years old and won't last indefinitely. DP has said an unvented is prefereble - but has also said he'd be worried about pressurizing my gravity system if I fitted a combi. What's the difference between pressurizing it with an unvented...
  8. M

    I've provided a lovely new cold feed going exclusively to a new combi. A quick question.

    I have said above (a couple of times) that I have had a PRV on the main for the past 18 years and changed it last week for a new (drop tight) one. I have made a note to ask the installer of any new combi if he considered a mini expansion device. Your assertion about loss of one drop of water...
  9. M

    I've provided a lovely new cold feed going exclusively to a new combi. A quick question.

    I don't know if I have one inside the Classic. I could check the instruction manual I suppose. Obviously can't do a physical check. I haven't said there's no F and E in the loft. There is one up there. I've said, more than once, what my flow and pressure is. 38 litres per min and 4 bar. I...
  10. M

    I've provided a lovely new cold feed going exclusively to a new combi. A quick question.

    All received, thank you. I now see that what you refer to is known to me as a "Mini Shock Arrestor" as typically manufactured by Altecnic, Flomasta, Ideal etc.and is often apparently installed to prevent or to overcome water hammer and, as I believe you said, is specified for the Vogue although...
  11. M

    I've provided a lovely new cold feed going exclusively to a new combi. A quick question.

    I just found the thread in which a contributor recommended the course of action that I followed. But it wasn't on DIYnot, it was the Screwfix forum and it dated back to 2010 and it resulted in a dialogue in which another contributor ridiculed the plan but the proposer, who's advice I followed...
  12. M

    I've provided a lovely new cold feed going exclusively to a new combi. A quick question.

    I did spend half an hour with YouTube and if I'm honest, apart from it having a big bore stainless steel HEX, it didn't do anything to make me change my mind about a Vogue.
  13. M

    I've provided a lovely new cold feed going exclusively to a new combi. A quick question.

    I know very well that Worcester and Vaillant are the two names that constantly appear when discussions are conducted about which boiler to go for. I'm aware of drawback to all boilers but I don't have great feelings for either.. I looked long and hard at Intergas and, more recently, at...
  14. M

    I've provided a lovely new cold feed going exclusively to a new combi. A quick question.

    It was 7 bar when I moved in, as mentioned ...now 4 bar, as also mentioned - apparently as more houses were built in the town the water supply had more demand and the rate came down (unlike my Council rates, which go up). But I'm thinking 4 bar is plenty. I've reduced it to 3.5 bar with a PRV as...
  15. M

    I've provided a lovely new cold feed going exclusively to a new combi. A quick question.

    I already planned to fit a pressure reducing valve (as I mentioned in a previous reply) but that's not what you're saying. As it happens I was going to ask the installer whether it's advisable to fit an expansion vessel to the heating circuit as there's 15 rads (albeit not huge ones) in order...
  16. M

    I've provided a lovely new cold feed going exclusively to a new combi. A quick question.

    Your shower will get it's hot water from the boiler ,and a little cold will be added to achieve your desired showering temperature. I have to perfectly honest and say I hadn't, in all this time, appreciated the obvious, realistic point you make there. I, mistakenly, kind of saw the hot and the...
  17. M

    I've provided a lovely new cold feed going exclusively to a new combi. A quick question.

    ^^^^ Thanks for taking the trouble to come back to this. I can obviously see what you're saying and why you're saying it. I can't and won't disagree because I don't have any arguments to offer ... but if I were were forced, on pain of death, to find some sort of logic for doing as I did I...
  18. M

    I've provided a lovely new cold feed going exclusively to a new combi. A quick question.

    All received, thank you very much. But Terry was saying it's a waste of my time - and you're saying it's a very good idea for me. I'd say there was a difference of opinion .... but we won't dwell on the matter. Thank you again.
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