Greetings fellow techies - I have an old "pickle barrel" hot tub with a mechanically controlled Laars nat gas heater. I have tried to find a generic electronic controller for it but there seems to be only propriety units available. I am not an electronics genius but have sufficient tools, supplies and abilities to build one. What I need is a unit which has digital temp display, capable of two modes, i.e., temp maintenance ( not in use but holds temp to about 65 F ( tub is outside in Canada)) and in use ( maintains temp about 103 F with cut in and out @ +/- 1 F ) which would allow for adjustment of desired temp, up or down in a range of say 5 F. I would like to use supply voltage of 24V as my work provides me with components that use the same. It would also be nice to have the ability to link the unit to a second unit ( one inside the house and one at the tub ) either of which can be utilised. A design and component requirement list would be appreciated if anyone is up to the challenge. If anyone knows where such a device could be purchased that would also be helpful. :?: