OEM Replacement Honeywell Power HPT2450 24VAC, 50VA plug in transformer

Used this 2450 to replace my transformer in my carriage light out front. I expected a Honeywell transformer with two screw wire connectors as the order photo clearly shows. I got an off-brand transformer with three screw connectors. See photoInstalled, and it did work.Update:Worked for three days.

Using this to power a water pump in an RO unit. The factory one doesn't last so I thought I would step up to this 2 amp unit. Working well so far...

Product was some unknown name company not Honeywell. False advertising.

The other half of what my Nest needed is a relay.I have an old boiler with two wires going to a mercury thermostat, which I replaced with a Nest Thermostat E. The Nest kept losing power and would call for heat (whether I needed it or not) to steal power for itself. This transformer, along with a 24V relay, makes my thermostat happy.For those who care, here's how I wired everything:Previous wiring: The Aquastat has a T and TV terminals. When these are connected, a circuit is completed and turns the boiler on for heat. Red and white wires connect the T and TV terminals to the old thermostat. When the thermostat determines we need heat, it completes the connection between R and W, which effectively completes the T/TV circuit for a call to heat. I disconnected the Red and White wires from T and TV.New Wiring: (aquastat and relay are downstairs)(thermostat and transformer are upstairs): T ---> any Normal Open Terminal on Relay TV ---> other Normally Open Terminal on RelayWhen the other side of the relay gets a complete circuit/connection, it closes the Normally Open side, which completes the T/TV circuit and turns on the heat. any terminal on other side of relay ---> Red Wire to upstairs ---> see below second terminal on other side of relay ---> White Wire to upstairs ---> W terminal on Nest either side of Transformer ---> R terminal on Nest other side of Transformer ---> C terminal on Nest AND Red Wire from downstairsSo, what we have here is the transformers complete circuit going to through the thermostat to the other side of the relay downstairs. One transformer wire goes directly downstairs on the Red Wire. The other transformer wire goes to the thermostat's R terminal. To get heat, the thermostat makes connection from R terminal to W terminal. The W terminal is connected to the White Wire to downstairs. So, for the circuit to call for heat, one transformer wire goes directly downstairs, the other goes through the thermostat to downstairs.I hope this text provides a suitable picture for those who may need it.Oh, there's one more thing: The transformer pictured and two terminals. The one I received was the updated transformer, which has THREE terminals. The terminal in the middle is a ground, which I left unconnected.

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