Light Commercial Boiler Reviews

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tm plumbing

I've been asked to quote for a replacement 50kw boiler in a welfare club & notice Vaillant and Viessmann do 46kw & 45kw models respectively. Has anyone fitted any of these sizes & any reviews much appreciated.
Thanks
Trev
 
Viessmann commercial are horrible. Worcester Bosch have taken over Buderus and rebadged the GB162. Lovely boiler. Gets my vote every time.

On a similar note ferroli are sneaking out commercials under the Lamborghini badge. Give them a steer too.
 
Why one large TM? Can't you go for two 26kW on a LLH ?

Should still be able to get it of a U6 a John ? as its only light com LOL
 
chris watkins said:
Why one large TM? Can't you go for two 26kW on a LLH ?

Should still be able to get it of a U6 a John ? as its only light com LOL
Click to expand...

No reason Chris I've not seen existing setup yet so keeping an open mind, two might work better depending on how they use it & their HW demands. I've not fitted a lot of 40+kW so was just looking for reviews. I did fit a Keston a few years back in a church but believe they are high maintenance. If it's the one big one it's looking like the Vaillant but I'll call my Worcester rep for a heads up too that's if I get the job ;-)
 
Two logics systems on a LLH or two heat only on a cascade. If it's a cascade make sure u have good filtration .
 
Anyone would think I worked for Remeha but I think the Quinta pro 65kw would serve you we'll. nice compact wall mounted. 900 by 500by 500 mm.
 
I don't mind the Quintas or the boulters, flavor of the moment would be a ATAG for me though. the do a 38 or a 51kW
 
Had a look at this the other day & 2 Worcester Cdi 30 kw with a low loss header looks the way forward. Also 2 250L cylinders. It has 3 heating zones plus HW.
My dilemma is whether to introduce pressure to the malleable iron or not.
Anyone used a low loss header on an open vent system as I've only ever seen them used on sealed systems.
 
If it is an old dirty O/V system might be an idea to leave it that way but I understand some are using large plate heat exchanges instead of LLH that way new boilers with small water ways can be on sealed system while old system remains open.
Although risk of plate blocking they are a dam-site cheaper than a boiler or two (spare could be left on site ready).

Not done personally just heard about, would be interested to here from anyone that has.
 
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Just fit a 45kw vaillant with a circuit splitting plate hex. worked a treat..boiler seems good but only been in a month..we usually fit ATAG's but controls aren't as user friendly personally speaking..
 
We all know you take a chance putting and new boiler on an old system, the plate is a good idea but it means two pump if you have two boiler that's three pumps,the nice thing about a plate is you can strip it down, never ever fit a solid one, a plate will bump he cost up a bit. A tube one as Ermi says will do also but not many around make them any more, made to order perhaps, you could suck it and see mag-filters and mesh filter.
 
Quinta for me. Simple little boiler. Well built never had issues with the well maintained ones. Well apart from a h/e that corroded. But that's one. Never got along with Atag myself. Had too many bad experiences with non user friendly controls. But they obviously may have changed now.
 
Also, go with a plate, as said one that splits down into sections. Strainer and dirt separator is a must
 
i would go with the plate exchangers aswell. we fit them on all our systems where we connect to existing systems. If you did want to seal the existing side and are worried about pressurising the steel pipework, you could look at a spill and fill system.
 
missplumb said:
i would go with the plate exchangers aswell. we fit them on all our systems where we connect to existing systems. If you did want to seal the existing side and are worried about pressurising the steel pipework, you could look at a spill and fill system.
Click to expand...
Spill & fill system ???? more info please :confused5:
 
chris watkins said:
Spill & fill system ???? more info please :confused5:
Click to expand...


Chris,


I think he means the use of a spill back tank, now not used, I have only seen a few in my 55 years in the trade, usually a large tank on the plant room floor 1/2 full of water, plastic balls floating on the water, and a spill back PRV when the water in the system expand it spills back into the tank, when the system cools down the pressure set puts the water back into the system.

Normally on a big job with a high head that won't support a membrane in an expansion vessel, the last one I worked on was about 10 floors offices, about 4.5 Bar system pressure with steel tube boiler rated at 6.5 bar.

PS Usually large volume of expansion required
 
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happyflyer said:
Chris,


I think he means the use of a spill back tank, now not used, I have only seen a few in my 55 years in the trade, usually a large tank on the plant room floor 1/2 full of water, plastic balls floating on the water, and a spill back PRV when the water in the system expand it spills back into the tank, when the system cools down the pressure set puts the water back into the system.

Normally on a big job with a high head that won't support a membrane in an expansion vessel, the last one I worked on was about 10 floors offices, about 4.5 Bar system pressure with steel tube boiler rated at 6.5 bar.

PS Usually large volume of expansion required
Click to expand...
Well you learn something new every day !! Thanks for that happyflyer.

I think that is what I will miss most, as of next week I will no longer work in the plumbing industry. (some say I never did)

Still there will be plenty of new learning to be done!

If you lot will allow it, an ageing ex-plumber may still stick his head in the arms every now & then for a swiffty & chew the fat.
 
Ermintrude said:
Where u off Chris anywhere exciting?
Click to expand...
Apprentice manager for that service laying company, they will be learning gas/water then power/fibre over six years to become multi-skilled team leaders. Thats the plan any road.
Wish me luck, looks like I will be travelling the country.
 
aah man. youve got to stay in the arms..whats a dispute without a sprinkle of watkins spice..;)
 
chris watkins said:
Apprentice manager for that service laying company, they will be learning gas/water then power/fibre over six years to become multi-skilled team leaders. Thats the plan any road.
Wish me luck, looks like I will be travelling the country.
Click to expand...

You can go and visit croppie in your travels then ?
 
chris watkins said:
You have had the best of me mutley, bleed me dry you have, if you can't do it now there is no hope LOL.
Click to expand...

I really am going to miss those water regs quotes. I believe you gave me your email so there is no hiding from me. I am not ready to go it alone yet!

Sounds like a great New challenge for you there. All the best a
 
He will still keep in touch I have no doubt good luck in the new learning curve, Chris can't you keep your hand in at weekends
doing odd plumbing jobs :yawn:
 
Getting thread back on track, so I've been given the job so looking forward to this one.
ive specd it up on 2 Worcester CDI 30kw system boilers with 2 unvented 250L solar cylinders (solar added at a later date) I'm going with the plate heat exchanger to separate the existing heating from the sealed new side which will heat the cylinders & the PHE on a sealed system using the boilers (swep B28 or B56 I'm looking at, anyone used them ?) internal pumps. The heating pump is staying (large Wilo) & will be connected to the O/Vside of the PHE. I'll be power flushing the 3 heating zones & running a magnacleanse. So I'm hoping once the existing setup is flushed / treated I should be able to connect the heat exchanger onto the pump & set up the wiring. Any advice on the wiring regarding relays etc much appreciated. Existing zone valves are 1"1/4, 1"1/2 & 2" iron connections & I'd like to be able to control each zone individually.
The only thing nagging me now is going unvented on the hot water, I'm replacing a horizontal calorofier with the 2 cylinders picking up the secondary return, again bit concerned about the pressure so still might leave the h/ water vented.
Comments welcome
Trev
 
go unvented bet diamonds it'll be fine. wiring dunno. looks like a decent set up though..:) Btw wheres chris..
 
Well the price of the plate heat exchanger may have to change the design on this as it's silly money.
i might go with the low loss header as an option but want to keep the existing heating open vent.
Can I keep the primary side sealed and circuit side o/v ? Anyone done similar.
 
You can make your own hex for £300

You need 225 and 3/4 barrel welder. Cut 225 at 1800mm long. Weld 2" ports on 225 for ov to tie in one top and one bottom use it like LLH Get two plates 225 clap together and drill 1/2 holes in them. One center and think 6 surrounding it. Get 3/4 welded between them so water will flow from one plate to next via tubes. Get 5 baffles welded on along its length - just for turbulence in secondary water.

Plates need to fit snug on to 225 now weld up end caps so 225 tube is tight . Make two ends hats for it , 225 tube and flanged end caps tee in 35mm near flange. 35 is for boilers. Set top or bottom as flow depending on if you want constant temp . Try and fabricate a cone onto flange plate to act as turbolator in flow feild.
 
It's less than 75kw. Gas carcas less than 35mm and within volume? It's domestic other than If it's in a plant room. But u can fit domestic boiler on commercial gas if there is ISo valve on your leg. U don't need a test point as u can do a TT using the test point on the gas valve for inlet pressure.
 
Ermintrude said:
It's less than 75kw. Gas carcas less than 35mm and within volume? It's domestic other than If it's in a plant room. But u can fit domestic boiler on commercial gas if there is ISo valve on your leg. U don't need a test point as u can do a TT using the test point on the gas valve for inlet pressure.
Click to expand...

But you should have one to check your pipes are correctly sized.......
 
Ermintrude said:
But you should have one to check your pipes are correctly sized.......
Click to expand...

so all i need is for someone to cut in to the 1 1/2 iron and leave an put 28mm iso and and test point and I can carry on from there? run will only be 5 metres. it is in a church though so What about commissioning?
 
mutley racers said:
so all i need is for someone to cut in to the 1 1/2 iron and leave an put 28mm iso and and test point and I can carry on from there? run will only be 5 metres. it is in a church though so What about commissioning?
Click to expand...

As far as I'm aware your fine.
 
thanks. 28mm will be good. And, it will be the only appliance running off this gas supply. At the moment there are 3 zones on this. Hot water and 2 heating. each heating zone is 17kw's. They want to add another 15kw to one zone. As it is an open vent and the old one is a system, would it be good to put a separate pump on the large zone and run the hot water and small heating off one pump? The hot water will be timed to come on an hour before the heating.
 
So I've got the 2 Worcester cdi 30kw system boilers on the wall, if I can get a Heat exchanger am I right in thinking I can just use 1 side sealed & keep the heating side open vent using the pump after the plate to circulate heating.
 
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