Reddit reviews Elk TRG2440 24VAC, 40 VA AC Transformer with PTC Fuse

Is there any way you can just power it with a separate transformer like this one?

https://www.amazon.com/dp/B0007N5LJK

That’s what I’m doing with two of my four ecobees and they’ve been great.

Ok - the following should help you get your thermostat installed:

• You need an external transformer to power the ecobee3. I have used this specific model:
  Elk TRG2440 successfully with ecobee Smart Si and ecobee3 thermostats.
  
• Connect the output from the transformer to Rc and C terminals on the ecobee.
  
• Connect one of the wires from your boiler's control interface to Rh and the other to W. Configure the ecobee3 to ignore Rh.
  
• Basically, follow the instructions in this Amazon review
  

If you have a nearby outlet, you can supply 24v AC with a wall transformer:

https://www.amazon.com/Elk-TRG2440-24VAC-Transformer-Fuse/dp/B0007N5LJK

Power is power. You thermostat doesn't care where the power comes from, only that it's there.

I picked up one of these.

Elk TRG2440 24VAC, 40 VA AC... https://www.amazon.com/dp/B0007N5LJK?ref=ppx_pop_mob_ap_share

I know the Fast Stat is supposed to work, but I haven't tried it. This is what I bought: https://www.amazon.com/gp/aw/d/B0007N5LJK/ref=mp_s_a_1_4?ie=UTF8&qid=1503173866&sr=8-4&pi=AC_SX236_SY340_QL65&keywords=24+vac+transformer&dpPl=1&dpID=51lPbJGbTOL&ref=plSrch

Think of it as a power brick for the Ecobee. But you also need electrical wire to go between the transformer and the Ecobee. I was lucky enough to be able to run the wire into the basement and plug it into an outlet, so that it's not ugly by the Ecobee.

step down transformer

Instructions from an Amazon reviewer:

• Connecting the transfer I did the following:
  
  
• 1 wire from transformer to Rc
  
  
• Other wire from transformer to C
  
  
• Nothing connected to transformer Ground
  
  
• The HVAC Red lead to Rh
  
  
• and the rest I connected to their proper colors.

I’ve done this for 5 years with 7 apartments.

• Ring Pro
  
  
• Transformer
  
  
• 22ga wire
  
  
• Duck brand tape in a color that matches your door frame
  
  Duck brand tape is not overly strong, does not leave residue when removed. Rip two strips and affix them vertically to the side of the ring, then tape the wired doorbell to your door frame on the hinge side of the frame. Run the wire through the hinge side of the door. Wire goes into transformer, plug into wall near door.

24 for sure.

AT140A1000 40Va, 120V Transformer - 60 Hz. https://www.amazon.com/dp/B000K2EC7K/ref=cm_sw_r_sms_apa_i_YyYCDb3M4117C

or plugin...

Elk TRG2440 24VAC, 40 VA AC Transformer with PTC Fuse https://www.amazon.com/dp/B0007N5LJK/ref=cm_sw_r_sms_apa_i_BxYCDbVTETP7B

For my doorbell, this is the one I use.

https://www.amazon.com/Elk-TRG2440-24VAC-Transformer-Fuse/dp/B0007N5LJK/ref=sr_1_8?keywords=ELK+TRG2440&qid=1565195451&s=gateway&sr=8-8