I was just looking at this as I primarily use my Disco for winter time transport, looked like a neat setup self contained. Not even sure of the lower hose diameter of my setup.
http://www.roversnorth.com/store/p-2...ater-1-12.aspx

 

I have the circulating tank style on mine, seems to work pretty good. It takes about an hour +or- to go from around 15-20* to 100* water temp. Best part I like about the circulating tank it actually pumps the fluid around instead of thermosyphon (heat rises cold sinks). I have used the lower radiater hose style before they work fine just seems to take a lot longer for warm coolant to circulate.

Heres what I have on mine.
http://www.warehouseautoparts.com/Sp...3200_13222.htm

 

So they one you have actually hooks into the heat hose and circulates the water? That is an neat idea I was thinking of just plugging the stationary one in all night when it was cold out. Probably wire it up to a water tight junction with a breakaway pigtail in the event that I forget to unplug it and leave my house. What part # circulation unit did you order?

 

coot....I used to have an "in hose" heater but even left on 5-6 hours , it wasnt very effective. this summer I installed a block heater ( the freeze plug replacement kind) an am really pleased with it. It's gotten to 20 below here a couple of times here this winter and only plugging it in for a couple of hours seems to make a big difference. most of the rove shops want $170.00 for one, I got mine from advance auto for $50.00

 

Its a Kats 13080 if I remember corectly. I agree with XCELLER8 on the frost plug heaters I think they are a little more efficiant but not that easy to install compared to cutting a heater hose. I had the tank style on my old dually and it would take forever to warm up 6-7 hours but in the disco it just takes about an hour depending on outside temp.

 

NAPA has the heater hose style up to 3500 watts. Twenty minutes to warm a cast iron engine. Gotta love that. Electric meter sounds like a high rpm fan though ($$$$).

 

Aren't all Discos equipped with block heaters from factory? I have a frost plug type. But if I had to buy one I'd go for a circulating one, like the ones used on heavy equipment. A circulating heats the whole block instead of only a part of it.

A frost plug type takes usually up to 4 hours to heat the block efficiently, the circulating takes approximately 1 hour, my dad has one of those on his diesel tractor and one hour is usually enough.