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Combi Boiler or Conventional?
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jemball
Posts: 88 Forumite
Can a combi boiler really provide simultaneous hot water to a sink tap, and two showers provided it has enough capacity? (We have 4 bedrooms with CH and some sources only recommend combi boilers for max 2 bed flats) If yes what make of boiler and what capacity is recommended?
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We have a 4 bed semi with 2 bathrooms and never had a problem with the hot water supply, takes a few secs for it to come through but with the right sized boiler and correct water pressure they work just fine in my experience.Signature No Longer acceptable -
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Many thanks for the info.0
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personally, i would go for a conventional, are you replacing one?. on average, combis are more troublesome and you may be disappointed with a combi hot water flow in a big house.0
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Yes I'm replacing a conventional boiler but both NPower and Thames Water are pushing combis, whereas a local CH firm advises against one because of flow problems and higher than normal pressure in the heating system. They actually suggest a conventional boiler plus a pressurised tank in the roof (to enable removal of immersion tank from airing cupboard). Hence my dilemma, compunded by the different ideas between yourself and the previous reply.0
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dear jemball we are in the bathroom business but are not plumbers, hence a different perspective. we get people ever week of the year complaining with ref to combis. Correctly sized in the right property they are great, one for my dads flat for eg. but we find plumbers often recommend them as they are the easiest to install. A combi heats water on demand and therefore for multiple outlets it can only heat a limited amount of water. I would suggest you will be disapointed if you try and run 2 showers and a tap at the same time, but this depends on what you consider to be an adequate shower. a mains unvented sytem, what i have at home and is the best system by far. Your local firm is absolutely on the right track. Just a note dont put a pressurised tank in with an integral pressure vessel, go for an external one.0
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you should check the governments regulations on boiler upgrades, I think you will find they recommend condensing boilers. You cannot run a shower directly off a boiler!
kat210 -
i think condensing boilers are now compulsory. cant run a shower off a boiler!!! what do you mean?kat21 wrote:you should check the governments regulations on boiler upgrades, I think you will find they recommend condensing boilers. You cannot run a shower directly off a boiler!
kat210 -
Dear ozskin, are you saying that even if I use an 'enormous' combi with my existing pipes then it could still not adequately feed multiple outlets?ozskin wrote:dear jemball we are in the bathroom business but are not plumbers, hence a different perspective. we get people ever week of the year complaining with ref to combis. Correctly sized in the right property they are great, one for my dads flat for eg. but we find plumbers often recommend them as they are the easiest to install. A combi heats water on demand and therefore for multiple outlets it can only heat a limited amount of water. I would suggest you will be disapointed if you try and run 2 showers and a tap at the same time, but this depends on what you consider to be an adequate shower. a mains unvented sytem, what i have at home and is the best system by far. Your local firm is absolutely on the right track. Just a note dont put a pressurised tank in with an integral pressure vessel, go for an external one.
Also, why do you recommend an external pressure vessel for the unvented cylinder?0 -
kat21 wrote:you should check the governments regulations on boiler upgrades, I think you will find they recommend condensing boilers. You cannot run a shower directly off a boiler!
kat21
There is a lot of confusion about Condensing boilers, a Condensing boiler doesn,t have to be a Combi!
You can have a normal wall mounted boiler that is Condensing, thus it is just a straight swop apart from the drain.0 -
ozskin wrote:dear jemball we are in the bathroom business but are not plumbers, hence a different perspective. we get people ever week of the year complaining with ref to combis. Correctly sized in the right property they are great, one for my dads flat for eg. but we find plumbers often recommend them as they are the easiest to install. A combi heats water on demand and therefore for multiple outlets it can only heat a limited amount of water. I would suggest you will be disapointed if you try and run 2 showers and a tap at the same time, but this depends on what you consider to be an adequate shower. a mains unvented sytem, what i have at home and is the best system by far. Your local firm is absolutely on the right track. Just a note dont put a pressurised tank in with an integral pressure vessel, go for an external one.
I second what Ozskin has quoted
Normal condensing boiler and a unvented cylinder is the best system imo, and cheaper to run over the year.0
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