system boiler advice

[G. Lasagne]

I have recently done a quote to replace an old ideal concord cx boiler,
the house has 17 rads (not worked btu's out yet) but would estimate looking at them i will need no more than 50kw.
the system has an unvented megaflow heatre sadia cylinder.

I normally knock back jobs like this, but it is for a building company who i have just started doing work for, so want to impress, i mainly stick to installing combi boilers as that is what im comfortable with.

My question is simply can anyone think of a good boiler to repalce the old ideal one with?

the pipe work is a mixture of i think 3inch threaded steel, 28 and 22 mm copper, the gas pipe is in 22mm from a domestic meter.

its a bit of a snakes wedding but ive managed to trace the pipes, but just worried that im a bit out of my depth, i have a trainee who has unvented quals.

Dave

 

[CKG]

Lats big job like that I did in a care home we piggy backed 2 30KW system boilers together so they wouldn't be without heat if one went down.

Works really well.


Keston, Veissman and Buderus do a good range of commercial condensing boilers.

All have very helpful technical departments that will help you make the correct plant selection.

 

[G. Lasagne]

Lats big job like that I did in a care home we piggy backed 2 30KW system boilers together so they wouldn't be without heat if one went down.

Works really well.


Keston, Veissman and Buderus do a good range of commercial condensing boilers.

All have very helpful technical departments that will help you make the correct plant selection.

thanks mate i did consider 2 boilers but we have issues on where to put 2 boilers because of the flue position. I have my local merchant making some calls fro me so will see what he comes back with, i have 12 weeks to do the job so will just get everyone to take there time.

The reason where doing it is because the old cylinder in the airing cupboard exploded causing over £50,000 in damage, ouch

 

[fisicx]

The reason where doing it is because the old cylinder in the airing cupboard exploded causing over £50,000 in damage, ouch

Forgive my ignorance on these matters but how can an airing cupboard cylinder explode? I thought it was just like a big kettle.

(make sure my question and your answer becomes a blog post - more content for G to index...).

 

[Dibs_h]

Lats big job like that I did in a care home we piggy backed 2 30KW system boilers together so they wouldn't be without heat if one went down.

Works really well.


Keston, Veissman and Buderus do a good range of commercial condensing boilers.

All have very helpful technical departments that will help you make the correct plant selection.

Keston boilers seem to be getting a bit of a poor rep these days as compared to that several years ago. Having said that some of their range go way beyond 50KW - so you shouldn't have an issue get one appropriately sized.

 

[CKG]

Forgive my ignorance on these matters but how can an airing cupboard cylinder explode? I thought it was just like a big kettle.

Get your pressure and limit thermostat controls mixed up on an unvented cylinder and this will happen.....

http://www.youtube.com/watch?v=ekEHfihiNz4

 

[G. Lasagne]

Its a bit of a mystery what happened but it was extremely messy by all accounts the whole house virtually needs refurbed.

 

[G. Lasagne]

Get your pressure and limit thermostat controls mixed up on an unvented cylinder and this will happen.....

http://www.youtube.com/watch?v=ekEHfihiNz4

thats exactly why i dont take on these sort of jobs

 

[chartergas]

gas angel
i think you will be way over with 50kw
you need to size it properly and the retarded part L whole house method wont work on a house that size. you should get the heating calculation program from Heating and hot water council

or at worst you could give me aoll the measurements and i can punch it in

if you have 3 inch steel you may well need a header and secondary pumps

Why not look at the ATAG boilers they are simple to use and easy to wire up to!


www,Atagheating.co.uk

I attended to a boiler 60 kw fitted to a 21 radiator system and the kw was way too high
i dragged it right back to 35kw!!! and still loads of heat!!1
you wont need much kw for the cylinder coil either!!

 

[G. Lasagne]

yeah i think your right to be honest, i have the measurements so gonna do it tomorrow, thanks, going back for another look on monday, there is already seconday pumps on the system which work fine, i think a standard system boiler may do the trick worcester do some high kw models, and i will look at atag too, never used them to be honest, normally stick to vokera and baxi, had quite a few call backs with the duo-tec though, and had to call baxi out, so much for boiler of the year.

 

[matty]

That's pretty funny seeing chartergas say Atag boilers are "easy to wire up". The system he's referring to sounds pretty similar to mine. We had some work done on it last year by an Atag qualified engineer (possibly even someone he knows quite well). We've given up waiting for the bloke to come back and finish it off -- especially after we discovered he'd wired up the main valve back-to-front. (As a result, when cylinder is calling for heat the system sends hot water flow to the radiators and vice versa!)

My general experience with Atag is that it's very hard to get hold of heating engineers who understand them. People familiar with other makes of boiler say that the way Atags are wired and controlled is very different from UK-manufactured boilers. I certainly wouldn't buy one again, and I'd be very wary of anyone who tried to recommend one to me.