Winter is upon us,
>formatting link
>
>(unfortunately there's no snow so the frost is going deep).
>
>We have an outdoor, above ground insulated cistern that
>we heat with a 120Vac sump pump that's works well.
>
>The problem is it's manually controlled, which is inconvenient
>when we leave for a week or two...
>
>So we need a thermocouple (thermistor) we put into the
>cistern and cycle it to keep the water temperature at 40F.
>
>Is there something on the market that can do that, I've looked
>and haven't found anything yet.
>If not, I'll design and market one.
>Ken
If you want simple quick and easy, visit your local home brew store for a thermostat to lager your brew in any ordinary small freezer. =20 Add relay to invert its output and set the temperature.