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Yes the pressure in the bathroom will be lower than in the kitchen a floor below... by about a tenth of a bar per meter lower it is... if I have got my sums right...

Not using 3kw of power to heat up some water only to let it cool down again seems like a fair saving to me... We just dont use much hot water...

^^^ exactly :) I cant really understand this. My investigations so far suggest a combi is only £50 or so more expensive than the equivilent conventional boiler... but a cheap hot water cyclinder is over £100 Thats before you factor in controls and extra pipe work and a circulation pump...

http://www.trademate.co.uk/Services/HeatLoss/default.asp?_brand=CP http://www.radcalcs.com/

EH?

When the fan went on our old conventional boiler we had no hot water or heat either (no immersion)... How much less reliable are combis? Do we have any firm statistics to go on? I am guessing we can save £200 on the installation and maybe £50 a year on fuel bills. If it then plays up once...

That was my original plan, but given that our hot water use is very sporadic I was guessing that the combi would work out cheaper to run and probably cheaper to install in the first place too... Also I have to knock the hot water load off the heating capacity so my heating requirement goes up...

... and so you send me back to where I started.. :? Wondering if the possible fuel and installation savings of a combi are going to be worth the potential for problems...

Already been warned off the "italian" stuff and the barbeque and winks stuff (not that I needed warning really I am not THAT daft)... :)

That's great... so I am back to a single largeish combi to power everything which is nice and simple and low on disruption. Do you recommend the Worcesters/Greenstar particularly, any you do?

Thanks. and that was just using the pump in the combi for all the circulation needs?

Excellent, thanks a lot. Was that a 35 HE plus? If so didnt you need another expansion vessel for that number of rads?

^^^ Thanks. Was that a combi or system boiler? Did it have 28mm connectors or did you just step up from 22 imediately outside the boiler? What pump? My mums heating guy said he seemed to get called out to a lot of Worcester boilers and to go for a Vaillant or Baxi... Would you agree or think...

So what was that set-up? Did you do anything fancy to make it work? What size pipes at the boiler?

Thanks for the replies. Not at all, just seems like the non-combis I have looked at dont have any higher rating than the combis (or am I missing something?) It does mean that I can fit a seperate pump though which means I should be able to get a big enough one. I was dead set AGAINST...

I have re-done my calculations to a better level of accuracy and am getting a heat requirement of 22kW so I think I can just about get away with a 28kw combi, but this is where I get confussed. The combi boilers I am looking at like the Baxi 100 and 133 are quoting CH output powers of 30kw...

Thanks a lot. That's the kind of thing I was worried about. My original thought was to go with an unvented cylinder and system boiler but the appeal of the combi was hard to resist. What would you say the reasonable limits for a combi are in terms of heating? 28kw and 12 rads? OR, Is it...

Planning on putting an entirely new system into an old house that has never had one before. My professional advice so far has been to go for a combi but the house is pretty big and its going to need a fair few rads. like 14-16. over 3 high ceilinged floors. I have done several different...

Thanks for replying... but... There is a 6 meter height, of foot-thick stone wall above the lintel... weighing around 16tons for the total width of the lintel..... I think I should prop the wall and let that support the piddling weight of the floors (say a ton and a half) ... I also think I...

As I said originally we are still in the nerve wracking purchase stages but assuming everything goes through OK my plan is to Blog the whole ordeal... I mean experience... Still looking for information on padstones and tree-heads... though the way steel prices are it might be worth...