A boiler cylinder thermostat is usually a small rectangular box, often with a temperature adjustment knob (which may be recessed for screwdriver adjustment), which is fixed to the side of the cylinder with a strap or cord going round the cylinder horizontally. Sometimes this is an elastic wire like net-curtain fixing wire. The insulation between the ...
The only things you need is a tap from Pink to connect to the B common wire and to flip the red and white wires on the Thermostat terminals: block.
Write down a big W above the T1 conn. and R below the T2 conn. label so you or whoever has to look at it later doesn't get confused.
You've got two yellow wires on the lower left.
One of those two is the C wire -- according to the wiring diagram it is the upper one, but check with a multimeter. Remember to set it to AC mode.
Once you figure that out, the easiest way to do it would be to connect it to a new terminal block. Then connect the C wire from the thermostat to that terminal ...
* heat (W)
* fan (G)
(note that on some furnaces R and W are reversed).
Standard answer is that either:
you have more wires in the thermostat cable that are not connected behind the thermostat one of which you can use as a C wire
you have some the willingness and ability to pull more cable to pull a c wire
you can get a 24v ...
In the first junction box with the first thermostat, connect with wire nut black wire from panel, black wire to next junction box, short pigtail wire to thermostat. Connect with another wire nut red wire from panel, red wire to next junction box, red wire to first heater. Connect black wire to heater to other connection on thermostat. Connect ground wire ...
That looks good to me, the second "C" terminal connects to the chassis in the background of the photo so it most likely is equivalent to the screw-down terminal.
fitting a crimp-on fork lug to the wire would be another alternative if you really want to connect to the screw-down terminal.
the aquastat is a brand name of water fired boiler controls. As such it controls a [water] boiler... as opposed to a furnace which only heats air.
the control relies on a well or aquastat well which is a brass/copper thingamajig that is part of the temperature sensor which protrudes into the boiler to measure water temperature. These get corroded and ...
A "freeze protection outlet" will let you plug a small heater (and/or alarm) in, and will only activate if the temperature dips to a dangerous level.
You can also use heat tape around any pipes that are likely to freeze, and insulate any pipes in under-insulated areas.
Finally, not all thermostats have an off setting. Compare this Honeywell thermostat, ...
In 1982 I had a somewhat similar problem while renting an upstairs apartment. Our downstairs neighbors had the thermostat in their apt and used to leave for the weekend and turn the thermostat down when they left. I investigated the furnace in the basement and found the wire to the thermostat, patched into it in parallel with a thermostat mounted on the wall ...