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No -- there is a "dip tube" attached to the inlet of the heater so the cold water coming in goes to the bottom and then up the heater as it is heated, with the hot port taking its output from the top …

A better solution would be to make the steam boiler a cord-and-plug connected piece of equipment. That way, you can unplug it from the mains and plug it into the UPS. … beefiest, heaviest-duty piece of cordage (such as 16/3 SOOW or SJOOW) I could get my hands on along with a nice, screw-assembly type plug on it and a strain relief gland or fitting at where it exits the boiler …

Wiring-wise: you have the correct idea Your proposed wiring scheme (R to R/Rc, G to W1, and C to C) is correct for the boiler you're working with; this can be deduced from the wiring diagram supplied on … require turning off automatic home/away detection to prevent it from causing daily recovery swings, as well as configuring the thermostat as described above to avoid uncomfortable "short cycling" of the boiler …

As it turns out, C is staring you in the face As it turns out, the transformer is sitting right in the middle of your photos, and by matching the wiring diagrams from your boiler's installation manual …

Your best bet here is to abandon hot water entirely and look at a different old saw: steam. One-pipe or two-pipe gravity steam systems can deliver solid heating performance without any pumps or other …

Putting the switching in the C wire, as the installers of your setup did, works, but has the undesirable side effect that grounding out the wiring from the zone valve to the thermostat or boiler control …

Connect C to the wire-nutted bundle of yellow wires According to the manual for your unit, the C-wire coming off your transformer is a yellow wire (we know this because the manual has it connected to …

Try switching the wire connecting the Nest's W output to the Nest's G output and seeing if turning the fan on causes the boiler to fire up. …

Tap the white wire in the control harness If you look closely at the wiring diagram for your boiler -- there is a 9 pin connector with a harness connected to it that connects to the thermostat wiring … Install your Ecobee, turn the boiler back on, and enjoy! …

You'll need a relay here Your boiler, in addition to using nonstandard wire nomenclature, does not provide 24VAC power directly to the thermostat. … One relay contact terminal (the COM terminal) jumpered to the Y terminal on your boiler The other relay contact terminal (the NO terminal) jumpered to the G terminal on your boiler And the red wire from …

Since tenants are involved, you'll need to do this right If you were owner-occupying a zoned single-family dwelling, then taking shortcuts in the interest of expediency would be an acceptable way to …

This is fairly simple According to the ladder diagram for your system, the thermostat simply connects transformer R to the call-for-heat signal on your control board, so this is straightforward. You …

The only goof is that the 24V from the transformer is AC so it really doesn't have a + or - side to it -- it's more or less a "hot/neutral" thing instead. Otherwise, what you have drawn out will work …

You have a short in your wiring Somewhere in the wiring for your HVAC system, Rc has shorted to Y. Find the short and fix it (using electrical tape to insulate the shorted wires will work for now gi …

Add a ground screw and land the ground wires there I'd use a self-tapping ground screw (Garvin GSST or equivalent -- these are different from regular sheet-metal screws in that they use a fine-pitch …