Hydronic coolant heater?
The installation is not difficult. After the heater control valve, the hose is cut off and routed to the diesel heater. From the diesel heater, it goes back to the other part of the cut-off hose that goes to the heater core.
You need a permanent positive voltage for the heater. The electrical connection is not very difficult. Once a certain coolant temperature is reached, the blower fan switches on and warms the interior and defrosts the icy windshield.
In my vehicles, I control the heaters via an app, but the receiver unit for the heater in the truck requires a SIM card. This allows me to start my heater from anywhere.
This is an older installation:










The installation is not difficult. After the heater control valve, the hose is cut off and routed to the diesel heater. From the diesel heater, it goes back to the other part of the cut-off hose that goes to the heater core.
You need a permanent positive voltage for the heater. The electrical connection is not very difficult. Once a certain coolant temperature is reached, the blower fan switches on and warms the interior and defrosts the icy windshield.
In my vehicles, I control the heaters via an app, but the receiver unit for the heater in the truck requires a SIM card. This allows me to start my heater from anywhere.
This is an older installation:










"You need a permanent positive voltage for the heater. The electrical connection is not very difficult. Once a certain coolant temperature is reached, the blower fan switches on and warms the interior and defrosts the icy windshield."
^So......Star Trek level technology is required lol.
I was planning on just hooking it straight to one of the batteries and use the coolant heater's remote to turn it on/off and keep it simple, but if I can Star Trek it like you did with not too much hassle I'd for sure give it a good attempt ha ha

Again, thank you VERY much @Hartwig

However, on days with severe frost, the doors are often frozen shut, making them difficult to open. That's why a remote control or app-based control makes sense.
These heaters are very common in our country and are also installed in many smaller cars with smaller batteries.
Thanks to the preheated engine, the starter motor also requires significantly less power to start the engine, which naturally puts less strain on the batteries.
this is my daily driver before and after


Last edited by Hartwig; Nov 1, 2025 at 06:45 AM.
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Last edited by wpg_250; Nov 1, 2025 at 06:59 AM.
Ford Trucks for Ford Truck Enthusiasts
However, on days with severe frost, the doors are often frozen shut, making them difficult to open. That's why a remote control or app-based control makes sense.
1. Control units/timers installed in the vehicle.
2. Radio remote controls.
3. Control modules via apps/cellphone.
The diesel heater is allways the same only the "signal modules" are different .
These two components must be compatible with each other.
The app is free of charge. However, there is the additional cost of the SIM card.
These two components must be compatible with each other.
The app is free of charge. However, there is the additional cost of the SIM card.
Do you typically run the fuel supply line to the vehicles fuel tank or do you setup a separate, smaller tank just for the heater?
I've though about running the fuel line for my diesel air heater to my truck's tank, but I'd have to remove the camper and lift the bed up and that's not something I want to do again so I have a 5 gallon tank in the rear storage box of my camper. I'm putting in a new air heater soon and now with the coolant heater arriving today I'm thinking it would be ideal to run both fuel lines to the truck's tank and I'm just wondering if I can just drill 2 small holes in the top of the tank, run the hard plastic fuel lines in and seal with gasket maker or something similar?
I have several of these metal pickup tubes, but not sure how I'd go about putting these in the tank?











