OK, little secret here, the old fart don't do U tube, I'm on dialup, and I see no reason to pay more money to the ISP. Hell dialup is faster than I can type.
Oh, about the beer, I fall asleep after 1, unless I have some good limburger on dark rye with onions to go with the beer.
Sterling actually offered a heater kit that would prevent a winter freezup, and there were still 47 of them in stock that went through the auction in 82. The company sold exactly 1, the salesman had 1 in his breifcase, and I had the other one in my parts box.
Fortunately the thermostats were off the shelf from WW Grainger or Honeywell, and got a quick Krylon job. The only thermostat I ever used was wired into the heattape on Wild Bills house roof. He really loved me for saving him from having to buy another thermostat when he had 4 in stock.
The controllers were made by TimeO Matic who's primary business was making light controllers for electric signs. They made a far superior controller to the original Sterling, and did it for a lot less money.
If a controller ran constantly it was because of a busted or misadjusted cam or a switch that welded itself shut.
I personally have no idea who the service man was who did it, but, I can assure you mistiming the pattern cam on purpose does result in the siren going into constant run mode. That makes somebody real popular in a small town. It also gets the bill paid.