This is a Server Products Model FSP 82060 Topping Warmer with Pump, a commercial-grade warmer designed to heat and dispense sauces and toppings. 
It has a 3-quart capacity and can hold a #10 can or a 3-quart stainless steel jar. 
The pump dispenses a maximum of 1 ounce per stroke, which can be adjusted in 1/8-ounce increments. 
It uses a wrap-around heating element with a temperature-controlled thermostat to prevent scorching. 
It is made of polished stainless steel and has a simple on/off switch.