ASHP and Microbore

[solarsavings]

I can't think why any plumber would run the last few meters to all rads in 10mm. I guessing you'll find 28mm-22mm-distribution manifolds-10mm-rads.

It can be, and is done without a buffer. I don't use either. You will need to increase the pump(circulator) size (or two in series) to get the flow without the velocity=noise.

Tip: Make sure all the existing rads are getting hot top to bottom and note how long its takes to get an idea of the set up.

 

[The Solar King]

We used to run in 10mm from 22mm flow and return, either direct or from a manifold. For reasons discussed we now use 22mm F&R with 15mm branches to radiators.

As with so many things, plumbers take the line of least resistance (eg combi boilers) and end up fitting less than optimal systems.

If you use a hgh quality plastic pipe, you still have the installation benefits of microbore without all the disadvantages. Replacing the pipework would also give the opportunity to properly insulate it. The reduced heat loss does make a difference.