New Combi running 2 showers advice!

[John Rumm]

One thing to beware of with the good doctors advice, he never points out the limitations of any solution he suggests.

A stored water combi for example may work well, but only if you cold main is up to providing the required flow rate. The same limitation would also apply to a heat bank solution or a unvented cylinder.

If you were running one shower on stored water, you would be able to use a significantly smaller (and hence cheaper) combi to heat both since it does not need the instantaneous power to do both. This is how a boiler like the CD50 appears to punch above its weight. It is not a hugely powerful combi, but does include its own small unvented cylinder that it can pre-heat and then blend with its output to achieve higher flow rates for a while.

[John Rumm]

So should that be Le or La Dribble then?

[Dave Plowman (News)]

Or, indeed, the fact that most cost far more than anyone would be willing to spend since there are far cheaper ways of achieving the same result in most cases.

[Andy Hall]

LeDrib'

This follows the French penchant for shortening things that don't trip off of the tongue easily.

For example, some Monoprix supermarket stores are signed as Monop'

[Matt]

The original poster said nothing about a huge country house with 40 bedrooms, they said their heating requirements were 19.6KW. Now this could be an *exceptionally* well insulated 40 bedroom country house or, as common sense would indicate something substantially smaller and more leaky.

The difference of 2.6kW from boiler output might be a design miscalculation or possibly utterly trivial as If the design outside temperature was increased from say -3 deg C to zero) then all the heating *and* hot water requirements might be fulfilled with the existing boiler. It's a calculated risk but in such a case any boiler resizing could be safely deferred for 15 years by the simple process of wearing a sweater and slippers if it ever gets *really* cold outside. Chances are with global warming they won't be required and a heat pump based A/C system might be more appropriate for both summer comfort and as an emergency winter top up. Additional insulation in the main structure of the house is possibly another viable route, the newly built extension might be up to standards but in the majority of cases the main structure could be seriously lacking. 500 quid spent on insulation could probably defer a spend of twice that on a new boiler.

But essentially if habits cannot be changed in terms of shower scheduling then water storage capacity becomes the only real issue, as such there is absolutely no need to spend money on new boiler when the installation of a new cylinder and a shower pump would do a much better job than a combi.

[Doctor Drivel]

This is terrible. He never kept his new years resolution and effed off.

[Doctor Drivel]

"handypandy" wrote in message news: [e-mail]...

Foget an unvnted cylinder.

Yep If you go stored water cylinder then go for an heat bank/thermal store.

No. For two shower and to heat the house the wall mounted Alpha CD50 is the way. simple and space saving and does what you want. You can go for floor mounted combis too, that perform as an unvented cylinder. I gave a short list.

You could also go for two combis, one for each shower and one doing upstairs Ch and one doing downstairs CH. backup is one is down too.

I would rather go for two smaller 24kW combis that one 40kW combi.

Beware of quarter baked suggestion from the amateurs here. A little knowledge is dangerous.

[Doctor Drivel]

Lord Hall, he is best going for two 24kW combis. A very cost effective solution to run and with backup too. He doesn't want a space consuming cylinder looking like a school boiler house - he has said that.

Lord Hall I has snip most of your tripe.

[Doctor Drivel]

You supposed to eff off. Please do.

[Doctor Drivel]

Please eff off. It is for your own good.

[Doctor Drivel]

Prey tell.

And that they do.

That is the same with any mains pressure system. It goes without saying.

Correct. See above.

You are getting there. V good.

Excellent on above point. 10/10.

[Ed Sirett]

I think this is the nub of the issue. Shower satisfaction covers a very very wide range between people.

[Ed Sirett]

Well start by reading the Boiler Choice FAQ.

[Ed Sirett]

I think you have painted the situation worse than reality by some margin. However, I can understand you wishing to do that simply to counter balance those who post extreme versions of the opposite view.

[Dave Plowman (News)]

A clear admission of just how unreliable they are?

And a lot of knowledge of catalogues is even more dangerous. But not of course to your pocket.

[Doctor Drivel]

But those in the big middle range are satisfied with 7.5 to 8 litres/min and

2 to 3 bar.

[Doctor Drivel]

Please eff off for new year. It will do you good.

[Doctor Drivel]

That is 20 years out of date.

[Doctor Drivel]

Lord Hall has, as he doesn't know much at all.

[Doctor Drivel]

You can? A person is coming here for proper advice, not the ramblings of madman.

Shishhhhhhhhhhh