Thanks for getting back to me. In answer to your question, there is another hot water tank which contains the hot water from the boiler – the solar system is a pre-heater. This tank though is a sealed unit, I believe of the bladder type.
I have taken water directly from the solar tank and it is already smelly.
Water from the well enters from the well through a Kinetico green sand filter, there is a header or pressure tank and the hot water then goes to the solar, the boiler and the hot water tank.
Apologies if I’m using the wrong terminolgy for these things – I am a Brit living in the States so may sometimes refer to a “spanner” when I should say “wrench”.
I appreciate your assistance enormously.