On Sunday, 3 February 2019 13:17:27 UTC, AnthonyL wrote:

The Baxi 105HE combi boiler is right at the back of the rear utility
room extension of a bungalow, approx 15m from the kitchen which is at
the front of the house and where the mains comes in.

The central heating is fine (touch wood).

Problem 1
=======

It is a real pain getting hot water to the kitchen. I calculate
there's 2.3l of water sitting in the pipes which has to be pushed out
before any hot starts to appear. And then 2.3l of hot being wasted in
the pipe when turning the tap off. Would you agree with these figures
and any suggestions?

one way to solve this is provide a microbore pipe back from outlet to DHW cylinder and add a minimal pump. Put it on a timer: when it runs you get instant HW. Lag the pipe run well.


Problem 4
=======

Turning on the cold water tap in the kitchen seems to deprive the
boiler of its hot water flow and causes it to run cold. Any
suggestions?*

assuming it's only turning to high flow that does that, throttle the max flow.


NT