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View the thread, titled "100KW gas boiler for domestic install!" which is posted in Boiler Advice Forum on UK Plumbers Forums.
leethegasman
Gas Engineer
J
josh
haha nice pic, where do people get theese figures from, with a larger house with system boilers i'd watch the expansion vessel, we normally fit heat only boilers for larger properties, that being one of the reasons.
See my pics for examples aswell.
See my pics for examples aswell.
I
infromthecold
Right I have been to house and measured the rads. All are Quinn double convector details listed below. Need 34KW to drive the rads so not 100KW. Can anyone recommend a boiler with correct capacity?
Cheers
[TABLE="width: 347"]
[TR]
[TD]Rad Size[/TD]
[TD]Power[/TD]
[TD]Number[/TD]
[TD]Total[/TD]
[/TR]
[TR]
[TD]1800x600[/TD]
[TD="align: right"]3497[/TD]
[TD="align: right"]1[/TD]
[TD="align: right"]3497[/TD]
[/TR]
[TR]
[TD]1400x600[/TD]
[TD="align: right"]2720[/TD]
[TD="align: right"]6[/TD]
[TD="align: right"]16320[/TD]
[/TR]
[TR]
[TD]1200x600[/TD]
[TD="align: right"]2332[/TD]
[TD="align: right"]3[/TD]
[TD="align: right"]6996[/TD]
[/TR]
[TR]
[TD]1100x600[/TD]
[TD="align: right"]2137[/TD]
[TD="align: right"]1[/TD]
[TD="align: right"]2137[/TD]
[/TR]
[TR]
[TD]1000x600[/TD]
[TD="align: right"]1943[/TD]
[TD="align: right"]1[/TD]
[TD="align: right"]1943[/TD]
[/TR]
[TR]
[TD]800x600[/TD]
[TD="align: right"]1554[/TD]
[TD="align: right"]1[/TD]
[TD="align: right"]1554[/TD]
[/TR]
[TR]
[TD]700x600[/TD]
[TD="align: right"]1360[/TD]
[TD="align: right"]1[/TD]
[TD="align: right"]1360[/TD]
[/TR]
[TR]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD][/TD]
[TD][/TD]
[TD="align: right"]14[/TD]
[TD="align: right"]33807[/TD]
[/TR]
[/TABLE]
Cheers
[TABLE="width: 347"]
[TR]
[TD]Rad Size[/TD]
[TD]Power[/TD]
[TD]Number[/TD]
[TD]Total[/TD]
[/TR]
[TR]
[TD]1800x600[/TD]
[TD="align: right"]3497[/TD]
[TD="align: right"]1[/TD]
[TD="align: right"]3497[/TD]
[/TR]
[TR]
[TD]1400x600[/TD]
[TD="align: right"]2720[/TD]
[TD="align: right"]6[/TD]
[TD="align: right"]16320[/TD]
[/TR]
[TR]
[TD]1200x600[/TD]
[TD="align: right"]2332[/TD]
[TD="align: right"]3[/TD]
[TD="align: right"]6996[/TD]
[/TR]
[TR]
[TD]1100x600[/TD]
[TD="align: right"]2137[/TD]
[TD="align: right"]1[/TD]
[TD="align: right"]2137[/TD]
[/TR]
[TR]
[TD]1000x600[/TD]
[TD="align: right"]1943[/TD]
[TD="align: right"]1[/TD]
[TD="align: right"]1943[/TD]
[/TR]
[TR]
[TD]800x600[/TD]
[TD="align: right"]1554[/TD]
[TD="align: right"]1[/TD]
[TD="align: right"]1554[/TD]
[/TR]
[TR]
[TD]700x600[/TD]
[TD="align: right"]1360[/TD]
[TD="align: right"]1[/TD]
[TD="align: right"]1360[/TD]
[/TR]
[TR]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[TD][/TD]
[/TR]
[TR]
[TD][/TD]
[TD][/TD]
[TD="align: right"]14[/TD]
[TD="align: right"]33807[/TD]
[/TR]
[/TABLE]
Advertise on the section of the forum saying I'm looking for gas engineer/plumber wanted. [DLMURL="http://www.ukplumbersforums.co.uk/im-looking-plumber-gas-engineer/"]http://www.ukplumbersforums.co.uk/im-looking-plumber-gas-engineer/[/DLMURL][/B] and get a decent guy down . bin the current guy.
I
infromthecold
I spoke to engineer today to say about 34kw load so why such a large boiler and he said he had a TSM from Worcester attending site tomorrow. I didn't know they had such a service so I called Worcester and they do indeed have such a service. I spoke to technical pre-sales asking for an opinion or insight and they said they couldn't give definite answers without seeing everything.
One thing they did mention is heat loss in the pipe work if the lengths are long.
Can this be so bad that it needs a lot of extra power in the boiler to compensate?
Do all the rads go on one loop?
Any insight or suggestions gratefully appreciated.
Cheers
One thing they did mention is heat loss in the pipe work if the lengths are long.
Can this be so bad that it needs a lot of extra power in the boiler to compensate?
Do all the rads go on one loop?
Any insight or suggestions gratefully appreciated.
Cheers
T
TBServices
Just forget this guy ever mentioned 100kw. It's now irrelevant. I think I'd be looking for a new installer tbh.
K
kirkgas
You will only need a 100kw boiler if you intend to turn the house into a marajuana factory to supply your whole town
Get someone else in to suss it out, very rule of thumb is 2.5-3.5 kw per room ( this allows for variables of room size) as a quick calculation, so a 100kw will do about 30 rooms haha
As suggested go with a system boiler and unvented cylinder you won't regret it
Get someone else in to suss it out, very rule of thumb is 2.5-3.5 kw per room ( this allows for variables of room size) as a quick calculation, so a 100kw will do about 30 rooms haha
As suggested go with a system boiler and unvented cylinder you won't regret it
100kw of lights will do a lot of plants and the heat off them will mean you wont need a boiler 🙂
R
Rickster123
I knew kirk didn't buy that Lamborghini from working in the training centre!
K
kirkgas
I've never tried it, but I've been in 100's of houses where they were smoking it, and one many years ago in a multi storey flat in Glasgow which we got called out to in the middle of the night flooding flats below, police got called to attend for forced entry and the whole flat was full of ants, with a 10" gap path to walk round the whole place, the heat lamps were rigged of the power for the lift and the temp was sky high, as soon as the joiner opened the door the smell hit us and the cop radio 'd in for the drug squad, brilliant engineering and workmanship to set it up haha
Don't mention the Lambo it's away back and now I'm bored and invisible I'm my XF Jaguar haha
Don't mention the Lambo it's away back and now I'm bored and invisible I'm my XF Jaguar haha
That was Tamz. He's a coke lord, not a weed grower. Get your facts straight!! LOL
nah, he's just my number 2 😉
But you don't know if the radiators are correctly sized?
Use the Whole House Boiler Size Calculator to find out what size boiler is required.
It does not matter if the radiators add up to more; it just means they can run at a lower temperature.
I
infromthecold
Worked out what house requires previously and size, volume and construction need 32kw. Rads output 34kw.
Worcester TSM has been to house today to talk to engineer and he has said it needs a 65KW boiler and a U16. I am trying to get the contact details for the worcester TSM so he can explain his thinking.
Worcester rep not made his quota of GB162 this month?
K
kirkgas
If the rads req 34kw why does it need a 65kw boiler????
What the hell?
I implore you, please get another heating engineer round. This stinks. Even if you do it on a Saturday and just pay him to specify the system for you.
T
TBServices
Most will add 10% to each rad/room when sizing rads, which explains the discrepancy you've found.
Again, get a new engineer!
Again, get a new engineer!
F
Fishpond
A 40CDI should be fine. I recently fitted a 40CDI regular on a house with 31 rads. The whole house heating calc came to just over 37KW and it works perfectly well and is in no way undersized from an output perspective!
I don't think you need a light commercial boiler for what you have... 40KW domestic is fine
V
vern
Absolute horse sh 1 t if you need 65 kw you have a swimming pool to heat also, I specialise in larger properties and from the info you have given no way!
I bet even B & Q's calculator comes up with a total for a boiler size they stock;
B&Q Online: From Kitchens & Bathrooms to Sheds & Paving; plus planning tools
B&Q Online: From Kitchens & Bathrooms to Sheds & Paving; plus planning tools
Earlier you said that you had used several online calculators and could only get to approx 25kW. Which one did you use to get the 32kW?
I
infromthecold
Used whole house boiler sizing method which came out at 23kw Calculated Boiler Size
Used heat loss calculator to work out how much power required for each room and that came out at 23KW Trademate by City Plumbing Supplies
I also used [DLMURL="http://www.theradiatorcompany.co.uk/heatoutput/"]Radiator Heat Output Calculator and size calculator - The Radiator Company UK[/DLMURL] to see what radiator output was required for each room. Got the output for each room, added up and total was 24KW
Not sure if needed to add 2KW for HW so have added just in case which brings it up to 25-26KW
The 34 KW figure comes from using the radiator manufacturers technical data. I have looked up the output of each rad installed and the total out of all rads is 34KW.
Head spinning now :-( Have asked another installer to come to house and take a look.
Last edited by a moderator:
T
TBServices
Totally pointless thread now
C
Centralheatking
In from cold has keen confused - 100,00 btu not 100KW 30 kw will do his place
on a system boiler set up. 100kw will light up over 1600 60 watt light bulbs
- old type !!!!!!!!!! or 100 1 bar lecky fires
on a system boiler set up. 100kw will light up over 1600 60 watt light bulbs
- old type !!!!!!!!!! or 100 1 bar lecky fires
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