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RE: Combi boiler or pressurised cylinder?


  • To: <ukha_d@xxxxxxx>
  • Subject: RE: Combi boiler or pressurised cylinder?
  • From: "Kevin Hawkins" <lists@xxxxxxx>
  • Date: Mon, 22 Apr 2002 18:27:21 +0100
  • Delivered-to: ukha_archive@xxxxxxx
  • Delivered-to: mailing list ukha_d@xxxxxxx
  • Mailing-list: list ukha_d@xxxxxxx; contact ukha_d-owner@xxxxxxx
  • Reply-to: ukha_d@xxxxxxx

I have installed a pressurised hot water tank in a couple of properties now, in fact I have just completed one this week - it has the following advantages over a 'standard' system.
 
    Hot water is delivered at same pressure as cold - useful for good flow, particularly any with big shower heads
    This means that in a shower that has both hot and cold feeds the balance is better and the effect of someone else turning a tap on has less effect on temp variation. Modern shower mixers are so much better anyway nowadays.
    No header tank needed in loft - less to maintain, worry about, keep birds out of, stop freezing and if you needed to have the tank in a cupboard in a bedroom no noise when it refills.
    Immersion still available
 
    Disadvantage - as ever cost and that when you do pressure the old taps you need to check you have no leaks. Need a pressure escape pipe to the outside.
 
    A combi boiler of course is very different in that it does not store hot water - it delivers heat on demand and the size (BTU) dictates how much volume at a given heat it can deliver - I have however always had unsatisfactory experiences with combis mainly I think because the ones I have used have been installed under capacity meaning I got a poor flow (trickle) of hot water or could only get warm water. It used to take me an age to fill a bath with hot water. I also had a shower that was plumbed to both cold and combi hot and when the cold went up in pressure it caused the boiler flow to reduce and it went stone cold. Mine was OK in summer but in winter when the incoming water was much colder it couldn't cope. I think nowadays the combi's are much more efficient (condensing perhaps ?) and are probably a satisfactory experience. maybe someone could comment who has one. They must I guess cost less to run as they only heat on demand whereas storage cylinders are heated daily and not as required.   
 
    2p.......Kevin
-----Original Message-----
From: Timothy Morris [mailto:timothy.morris@xxxxxxx]
Sent: 22 April 2002 17:04
To: ukha_d@xxxxxxxSubject: [ukha_d] Combi boiler or pressurised cylinder?

I’ve just been sent a 4 page fax by my architect with questions on there. One of them is do I want a combi-boiler for CH and HW or a cylinder system operating at greater than atmospheric pressure.

 

Answers on a postcard please….

 

Tim.



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