|I should have fitted one of these much earlier... :(|
The guys are presently installing the evacuated tubes, and of course, the first thing they set up after the pumping station is an expansion vessel. I noticed this, and thought it was time to fit one to the existing Surya set up.... but having had to put about 8-12 litres of top up liquid into the system, I realised that there must be a leak - and found it eventually.
|Odd to say this, but the thermally insulated construction|
and the mirror has been 'too successful' and caused a big leak
in the plumbing because I was stupid enough to ignore the
need for an expansion vessel.
I also remember meeting David Matthews of the Ground Source Heat Pump Association at Ecobuild 2011. His comment on my system was that I should consider the risk of stagnation - which occurs when the pump fails and the liquid gets too hot. I should have done something about it last summer while rebuilding the external sunbox.