That was Tamz. He's a coke lord, not a weed grower. Get your facts straight!! LOL
-
We recommend uHeat for Underfloor Heating Systems, and The Wetroom Store for all things bathrooms and wetrooms. They provide discounts for forum members.
Welcome to the forum. Although you can post in any forum, the USA forum is here in case of local regs or laws
100KW gas boiler for domestic install!
- Thread starter infromthecold
- Start date
-
- Tags
- boiler gas engineer install
- Status
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
I
infromthecold
Hi
That's exactly what I thought but installer and now worcester TSM have said that not the case. So, with all the advice from everyone on here and my initial concerns I have another instaler scheduled to survey.
I am amazed that a representative of the manufacturer can give such poor advice :-(
You said earlier that you were considering a combi boiler as you had only one bathroom/shower. Is this still the case?
If it is, the size of boiler is really determined by the hot water requirement, which depends on the maximum incoming cold water flow rate. You can easily check this at the kitchen sink cold tap using a bucket marked in litres and a watch with a second hand. Time how long it takes to fill to the top mark (usually 10 litres); then convert this to litres per minute. The required Hot Water output of the boiler is at least 2.5kW per litre/minute; i.e a flow of 10 litres per min will require a 25kW HW output.
You can ignore the 2kW allowance for HW if you have a combi boiler.
As for the advisability of having a combi boiler, don't forget that all taps, hot and cold, as well as washing machines, dishwashers etc are fed from the one source: the incoming cold main. So there could well be a reduced flow rate if more than one tap etc is in use at the same time. If you have a garden tap, you can do a basic test to see what the effect will be. Repeat the flow test, but this time with the garden tap full open. You will then find the reduction in flow rate.
C
Centralheatking
so you could thank us all talk to the organ grinders not the monkeys
I
infromthecold
Many thanks go to all who have participated on this thread.
Without professionals like yourselves willing to share your knowledge and experience folk like me are in the dark.
Many thanks once again for everyone's help.
- Status
Similar plumbing topics
- Jacob Wiltshire
- Boiler Advice Forum
We recommend City Plumbing Supplies, BES, and Plumbing Superstore for all plumbing supplies.
