From the Alpha combi boiler instructions:
"Note: If the mains is fitted with water meter, check valves or loose
jumper stop cock, then a DHW expansion device must be fitted."
and there's a similar note in the W-B Si instructions, but not in, for
instance the Glow-worm equivalents. I can see that there is a risk of
trapping a quantity of water in a length of pipe, which then gets
warmer, but doesn't this apply to all cold water systems?
Does anyone fit these devices in real life?
- posted 12 years ago