I believe this will work on Verizon. The relays are only rated for 10 amps, but that may be enough for an engine heater. Take your heater wattage and divide it by the voltage and that will tell you how many amps it draws.

https://www.gsm-auto.com/

Here's something that may work on Verizon:

https://www.amazon.com/King-Pigeon-R...7466&s=hi&th=1

i think i would take one of these, no matter what they are rated for , and use them to turn on a contactor made by a vendor that had been making contactors for years. seems like that's where the smoke would start. anyway, i did.

Yes - you could most certainty use the 12V output from the RTU 5024 and use that to close a 30 amp 230 Volt contact. The recent issue of one of the magazines (maybe Sport Pilot) had an article about how to do this. I was planning on making my own until I found the KT-G3-A, which had everything in one package.

Unfortunately it won?t work on Verizon, these are gsm based, which isn?t supported by Verizon. AT&T and T-Mobile are your only choices.

A normal Reiff sump heat system is only 200-400 watts. That's 2-3.5 amps. I can't imagine a 10 amp relay struggling with that.

i also used the switch to preheat my shop in the hangar.

My understanding is that as of 1/1/2020 Verizon has converted from CDMA to GSM.

Do you have a reference? I don?t believe that is true.

I can tell you I have four devices on the Verizon network and none of them are GSM compliant. They would have to set up a completely redundant network to transition to GSM.

The reviews on Amazon were pretty consistent. All the reviews for the Verizon version of this device stated they couldn?t get their unit to work.