often when opening the hot tap (hot water is set to 45 degrees), the
hot water initially comes out scorching hot and then settles to just
'hot' which i can touch ok. so think its sending some water out at
central heating temp (72 degrees) first. is this a setting on the
boiler , anything i can do about it? its a glow worm 2 years old

benpost wrote:
often when opening the hot tap (hot water is set to 45 degrees), the
hot water initially comes out scorching hot and then settles to just
'hot' which i can touch ok. so think its sending some water out at
central heating temp (72 degrees) first. is this a setting on the
boiler , anything i can do about it? its a glow worm 2 years old

Its a known "feature" of some combis when they switch from heating mode
to HW. Especially if you turn on the tap at a slowish rate.

If you have a model that stores a small amount of preheated water (some
hold a couple of litres that they keep warm, ready to minimise the warm
up time), they seem less prone doing this.

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

benpost wrote:
often when opening the hot tap (hot water is set to 45 degrees), the
hot water initially comes out scorching hot and then settles to just
'hot' which i can touch ok. so think its sending some water out at
central heating temp (72 degrees) first. is this a setting on the
boiler , anything i can do about it? its a glow worm 2 years old

They all do that. Combis are great just as long as you're prepared to
accept what *they* give you rather than giving you what *you* want.

Tim