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Discussion in 'Central Heating Forum' started by Murdoch, Jul 8, 2018.
Discuss Mis-selling? Misleading? From yesterdays Times in the Central Heating Forum area at UKPlumbersForums.co.uk.
This caught my eye yesterday... can we believe any manufacturers compliance "claims"?
Doesn't surprise me in the slightest. In my view the idea that a combi is more efficient than a stored water system with a hot water cylinder is nonsense too.
recently sent my son to Amsterdam to the INTERGAS factory for a all expenses paid 2 day break the information he came back with was interesting boiler efficiency in England is determined using only the heating load , there is no consideration for the efficiency while the boiler is in hot water mode in Holland these are calculated using both heating load and hot water delivery making them the most efficient overall , why do not all manufactures do this well think we know that they would not meet the ratings stated for boiler +. cheers kop
Well, we've all seen an existing system bolted onto a new boiler with panel radiators that need high flow temperatures to work, haven't we?
Also, how many system boilers still do not have a high-fire mode, so they are necessarily set at a high temperature to re-heat the DHW cylinder, and then remain on that same high setting when working in CH only mode?
Re. Vee's point, I think a combi can work very well in the right circumstances, but not for everyone. On summer days when I am out all day and only use hot water for a shave and for washing up, and I have an electric shower, I expect a combi would use much less gas than my heat only boiler does, working at extreme part-load to make good the heat losses from a DHW cylinder.
Murdoch - thanks for this post. I think 'mis-sold' may be going a bit too far, but over-rated and misleading is probably fair comment.
Unfortunately I have to disagree as a combi boiler is by far more efficient than a hot water cylinder especially when having a second heat exchanger which uses the flue gases to pre heat the incoming mains cold water. If the boiler is correct installed with Trvs, and the right settings then there is nothing better than a boiler. But how often you come across over rated boilers for properties ? Almost every single customer I have has got boilers which are far too big and furthermore not even correct set up. Condensing boilers are not made to run with 75 flow temperature it’s just too high settled which is a waste of energy. It should be set to 55* .
There is something to be said for the right appliance for the scenario.In a 1-2 person accommodation or one bathroom dwelling with little space its perfectly fine.
Its when a combi is used to replace a conventional boiler and perfectly good stored system (pressurised or otherwise), all is ripped out and the fact ignored that there are several bathrooms in a family home with insufficient water flow and pressure. Most combi are not matched for the heating load either with excessive flow temperature.
The householder is more often than not being told its the best thing since sliced bread and of course they will more likely go for the cheapest quote. A few years down the line they realise there mistake and have to reinstate with unvented or similar.
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