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?
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?