For those cold winter days and nights we previously used an electric oil filled radiator. It really spins our meter so I have been looking for a new method. I just installed a Diesel Heater today. I think it’s going to provide the heat we need and it will not break the bank. Uses 1/2 liter per hour on high. Has a remote control and runs on 12v or 110v. Power consumption is 12A DC on startup then less than 3A running. They can be bought on Amazon for around $135.00.