Combi-condensing based system - pipe diameter?

[mooby]

Hi,

I've decided to install a new heating system in the near future after moving into this home from the 70's...

The thing is, I'm trying to research what is the best/most efficient system on energy, but not at the expense of performance.

I obviously want a warm home - achievable with microbore, but would also like to run a decent mixer shower in the upper floor off the system as well.

I understand that microbore is easy to install etc, but is there not a compromise due to the potentially reduced flow-rate, as the pipes are on average 50% smaller in diameter to traditional 15mm pipework.

Any advice gratefully received.

 

[oilman]

DON'T USE MICROBORE!! Plastic is easy and not so stupidly small.

 

[P.S.]

Use 22mm for main flow/return with 15mm feeds to the rads. I used Hep20, pulls through upstairs joists like cable ! No hacking the joists to bits and using cover plates... I didn't use plastic because I cant bend or solder copper, it has many benefits over copper.

 

[kevplumb]

Use 22mm for main flow/return with 15mm feeds to the rads. I used Hep20, pulls through upstairs joists like cable ! No hacking the joists to bits and using cover plates... I didn't use plastic because I cant bend or solder copper, it has many benefits over copper.

eh