I'm replacing one CH radiator .The system is 10mm copper with adaptors where the pipe enters the valves .. I need to alter a small length of pipe connecting the rad as the rad is a little larger than the old one . To make things look neater ( and to avoid buying a coil of 10mm) is it OK to use 15mm between the valves and just under the floor with reducers to join up to the 10mm ... Will this cause any problems .? Stuart
- posted
18 years ago