Well, my Leonard valve isn't in the same technical marvel class as the Hass.

But I run a steady stream into a gallon-sized stainless steel mixing tank (think stock pot).

Then the (you are so right David Lyga) leaky Nikor tank gets immersed completely into the 68-degree F water... the temperature of the bath is monitored by the CompnTemp USB probe.

I have to wonder though why there aren't more double-wall vacuum tanks... Doesn't the ASA specification require a thermos bottle?