Offered EV heater is liquid heater type designed to be a heat source for existing heating system instead of an ICE. All vehicle’s heat controls are retained and work the same way and apparent operation is the same. No under dash modification or taking the dash panel out is needed. The heater simply connects to the same heater core fittings at the firewall former engine hoses use to connect to, and on-off control switch is installed on the dash. The switch can be a regular toggle automotive type operated by hand, or linked to existing heat dial or lever.
The water (or regular antifreeze ethylene glycol solution for cold climates) temperature in the heater’s tank is maintained at 70°C±2°C (158°F±3.6°F). Electric circuit consists of resistive element immersed in liquid and controlled by a FET switch, in turn controlled by a PIC micro controller. The firmware is sophisticated enough to provide safety check and emergency shutdown if any parameters exceed specified limits or electrical connections become loose. In case of emergency the heater is able to discharge vehicle controller input capacitors. Open collector output allows to monitor status of the heater. All inputs/outputs are galvanically isolated from the high voltage (traction battery) circuit.
The plumbing fittings are 20 mm OD. Manufactured by MES in Switzerland, one year warranty.