HiI have sent this as a new post although I have asked similar questions on the same subject.
After exposing Hep2o pipework in studwork I find that the hot and cold are both in 22mm.
This chalet bungalow originally had a regular heating system as the old water tank is still
in the loft, but the boiler is now a combi.
From help received here it turns out that a combi boiler should only have 15mm pipework
because of the pressure etc.
So it seems that when the combi was fitted, the 22mm was not changed for 15mm.
For 8 years in the en-suite you have to wait ages for the hot water to reach the basin.
In winter this can be around 5 minutes if the central heating is not turned on - if it is turned on,
then hot water is delivered in around 1 minute.
The heat exchanger and other bits that might have caused this problem have been replaced
by British Gas, but that didn't help.
Now I can see the pipework, the run to the en-suite is around 8 metres in 22mm - then
changes to 15mm for 2 metres.
MY QUESTION
Although I should change this pipe run to 15mm - would I be better off using "10mm" for the
complete run, then just before the basin, change to 15mm?
Would it be like squeezing the end of a garden hose to produce more pressure?
We must have wasted so much LPG over the years, because the boiler fires when the basin tap
is turned on, but hot water takes so long to reach the tap.
Many thanks.
Stephen
