When we buy new device such as White Rodgers 21M51U-843 we often through away most of the documentation but the warranty.
Very often issues with White Rodgers 21M51U-843 begin only after the warranty period ends and you may want to find how to repair it or just do some service work.
Even oftener it is hard to remember what does each function in Electric Heater White Rodgers 21M51U-843 is responsible for and what options to choose for expected result.
Fortunately you can find all manuals for Electric Heater on our side using links below.