DURAWATT
®
ELECTRIC WATER HEATERS
PV500-6 05/13
15
7.8 Cleaning Electric Elements
Electric immersion INCOLOY
®
sheath elements are wound at high wattage ratings and must be completely covered
by water while in operation. Otherwise, they overheat and burn out. Scale from the water will collect on the
sheathing of the element over a period of time and must be removed periodically to extend the life of the element.
Water in some areas will produce the scale buildup more rapidly than other areas. The rapidity of the scale buildup
is also determined by the watt density of the element.
It is good maintenance practice to remove and clean 80 W/in² (18kW) density elements on a monthly basis. The
interval between removal and cleaning can usually be extended to six months when 40 W/in² (9kW) density
elements are installed. Most installations where 20 W/in² (4 1/2kW) density elements are used, require only annual
cleaning. Elements are cleaned by soaking in a scale dissolving solution. A 30” piece of four or six inch PVC pipe
with a cap on one end makes an ideal container for element cleaning. (See figure 12.) Contact a chemical supply
house for advice on the proper cleaning solution for your area.
Element Cleaner
FIGURE 12
