Electrical Heating System

An electrical heating system's design and installation are extremely important on emergency showers where no flow conditions exist. Thermal convection can cause considerable over heating of the upper sections of the shower if the electrical system is improperly designed or installed.

B-L-S Showers have the optimum amount of heating cable properly installed and with thermostats critically located so as not to result in more than a 5°F temperature variation anywhere in the shower unit.

The temperature control is important to personnel using the shower as they are protected from possible scalding which can result from an improperly electrically heated shower.

The electrical heating system normally used on B-L-S showers is listed by Factory Mutual for use in Class 1, Division 2, Groups A, B, C and D hazardous locations. A special custom designed electrical heating system is available that is listed by Factory Mutual for use in Class 1, Divisions 1 and 2, Groups A, B, C and D hazardous locations. (Depicted in picture at right)

The electrical heating systems used require 110 volt supply. Heating systems using other voltages supply can be furnished on request.

Good Insulation is extremely important in eliminating wide temperature variations in the shower unit and in preventing freeze-ups. B-L-S uses foamed in place urethane for insulation for minimum heat loss.

B-L-S Units use approximately 60 watts of heating to prevent freeze-ups. Competitors normally use 100 watts or more to prevent freezing. Additional heat is required with the loose insulation (used by competitors) but even the 100 watts or more is sometimes insufficient to prevent freezing. Using more heat makes it more difficult to eliminate large temperature variations within the shower unit.