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paulrog

Hi,
Now i'm not a plumber but have been plumbing in my house for years so happy to move pipework, install bathrooms etc.
My next project is to install 3 new radiators in 3 rooms which have previously had electric storage heaters. The radiators will be feed off the main boiler in the house which is a worcester hiflo 440.
Looking at normal radiator circuits the proper way is to break the flo/return pipes from the boiler to feed the 3 radiators, so you have 4 pipes to install, because of the way my house and the 3 extra rooms have been built i'm not going to break the flo/return pipes but to T into them to the first of the 3 new rads then "piggy back" the other 2 off it, I will adjust the rad valves to ensure enough heat goes to the last rad.
My question is do I use 22mm to the 1st or 2nd rad, then 15mm pipe to the 3rd rad? or just use 15mm all the way?
The distance from the boiler flo/return pipes to the first rad is 12 meters, 1m to the next, 3m to the last rad.
I don't want to put too much strain on the central heating pump in the combi boiler.
Any help or advise would be appreciated.
 
Agree with missplumb, always best you use 22mm where possible when adding rads to a system
 
Use 22mm until you need to branch off for each radiator. 3 radiators is quite a lot to add if they are big doubles. How big is your boiler?
 

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