Adding Rad

mattbb · Posted: Wed Sep 28, 2005 9:22 am Post Subject: Adding Rad

I wish to add an extra rad to my system into an extension.

The best place to pick up the system is in the upstairs bedroom and drop it out through the wall and down.

The new rad is 400 x 2000mm high, my existing system has 8mm copper from the rads `T`ed into a 15mm run under the floor.

It has a feed and return system and a pressure unit in the airing cupboard, it is not a combi boiler.

If i join into the 15mm copper with plastic and drop it out through the wall down to ground level do i need to then reduce to 8mm before going into the rad to keep the system flow the same or will i need to stay at 15mm because of the rad size?

Nige F · Posted: Wed Sep 28, 2005 9:39 am Post Subject:

Stay@15

mattbb · Posted: Wed Sep 28, 2005 10:07 am Post Subject:

Thanks

my other worry is i cant see past the one rad in the bedroom so i don't know how many rads are already coming off the 15mm, and how is the best way to know if i have the balance right in the system without a thermostat ?

slippyr4 · Posted: Wed Sep 28, 2005 10:22 am Post Subject:

Quote:

how is the best way to know if i have the balance right in the system without a thermostat ?

If you have no thermostat then it's a touchy-feely process. Tweak the lockshield on the new rad until you feel that the room is warm enough compared to the others in the house.

You can make it a whole bunch easier by fitting a TRV on the new rad. Even better would be to upgrade your controls to incorporate a room stat. And TRV's on all the rads.