Okay, then. It's -35°F this morning at my house in central Minnesota.
It's an adventure trying to get vehicles started. The '90 V-6 Toyota pickup has a regular frost-plug heater installed, but at these temperatures it takes a long time to thaw a whole engine with one of those.
Without boring all with extraneous details, I'm in a special situation where I can't plug the vehicle in overnight to 120 VAC. And no heated garage yet, obviously. What I need is a high-wattage engine heater to do it fairly quickly.
My old diesel tractor has a 1500-watt-ish one of those "tank heaters" that heat coolant and circulate it, installed in one of the cooling hoses, and it works wonderfully. A couple of hours plugged in, and it fires up like summer -- gets the engine near operating temperature.
Does anybody have experience installing one of those or something similar in their truck? One possible problem is that I guess those heaters work by convection, and so would need to be mounted low. Looks like both of my heater hoses pass through near the top of the firewall.