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Ask The Trades › DIY Forum › Plumbing Questions › Combi advice

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Combi advice (Read 2914 times)

aaahsodit

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Combi advice
Dec 19^th, 2005, 3:56pm

I am renovating later this year, part of which involves new central heating and other plumbing. I've decided to go with a wall mounted combi boiler and have done the calcs. I need a 30Kw unit with a flow rate sufficient to operate a thermostatic shower with reasonable pressure (12+ l/min?).
I am looking at the Worecester Greenstar HE range. Has anyone any experience - good or bad - with these boilers or can anyone recommend another brand?

Also, I am considering adding a second shower room downstairs using another thermostativ valve. Will the same boiler be able to run both (but not at the same time)?

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Lurch

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Re: Combi advice
Reply #1 - Dec 19^th, 2005, 4:13pm

TBH, since fitting my Greenstar HE I've gone off Worcester.

Within the warranty period (well, just outside but I managed to persuade them it was down to them to repair the thing) it's had to have a new fan and textdisplay. If I was to pay for these I'd have been footing a circa 400 quid bill.

My Dad, (who is a plumbing and heating fella) has also had some reliability issues with some more recent Worcester kit. He has fitted a few of the Alpha CD range recently and is impressed so far. Time will tell whether they are more reliable than the Worcester.

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thescruff Global Moderator Trade Member Author Offline Who said plumbing was easy. Posts: 6037 Total Thanks: 147 For This Post: 0 Gender: Trade: Plumber	Re: Combi advice Reply #2 - Dec 19^th, 2005, 8:00pm As a Combi lover NOT I wouldn't say any was more reliable than the other The Alpha the Company has been fitting is better than most in that price range. Was also looking at the new Boulter 600 range 28 kw combi at a training center and was very impressed http://www.boulter-buderus.co.uk
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CWatters

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Re: Combi advice
Reply #3 - Dec 20^th, 2005, 12:07am

I also did the sums awhile back. I think I posted them here somewhere. If you know the flow rate, the temperature of the water going in and out and the specific heat capacity of water you can work out how big the boiler needs to be in KW. I think I made it around 30-35KW just to produce a really decent flow rate (or allow a hot fill washing machine at the same time). I decided that combi boilers wern't for me.

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