On 19/01/2015 14:08, CB wrote:
On 19/01/2015 13:24, RJH wrote:
On 19/01/2015 13:15, CB wrote:
On 19/01/2015 12:40, Ron wrote:
Would it cost more to run central heating with an unvented hot water
cylinder and system boiler or a combi boiler with no HWC?

R.
In my opinion yes. All other things being equal there will be some heat
lost from the hot water cylinder which in summer will be wasted.


I think the 'all other things equal' would need to be qualified. For
example, I've got a dishwasher and an electric shower, so need very
little hot water from the boiler. And not everyone needs (or wants) a
room heated by the cylinder.

So you are confirming that (for you) a combi is cheaper than un-vented
HWC. I am struggling to come up with a scenario where the HWT may be
CHEAPER than a combi (but I can think of many scenarios when it may be
more convenient).

Or if, as happens here, you get fairly frequent power cuts then a combi
is a PITA. Also on the odd occasion you have a boiler problem you
immediately lose hot water. If someone is in the bathroom having a
shower then another person runs the hot water tap the showering person
will get an unpleasant surprise, all these things are avoided with the
none combi system you are considering. I moved over to a combi when I
moved here 15 years ago, gave me extra room as the cylinder had been
located in the bathroom. However it has many disadvantages.