Brochure

Hardness MG/L Grains Per Gallon

0-60 Slightly Hard 0-60 0-3.5

61-120 Moderately Hard 61-120 3.5-7

121-180 Hard 121-180 7-10.5

181-250 Extremely Hard 181-250 10.5-14.5

LEGEND FOR WATER QUALITY MAP

Protect your tankless water heater with

a Product Preservers

Anti-Scale Filter

Water quality will play a role in your water heater’s performance and cost of operation. Hard water scale

is the leading cause of failure in tankless water heaters.

• More than 85% of American homes have hard water

• Scale reduces the efﬁciency, causes the heat exchanger to overheat, and eventually damages it to the point it begins to leak water

A. O. Smith reserves the right to make product changes or improvements at any time without notice.