By Rand Ackroyd
While many advancements in preventing scald burns have been made over the past 25 years, the plumbing community still has a way to go. |
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The plumbing community can be proud of the great advancements it has made over the past 25 years in consumer safety and protection, through new products, product standards, plumbing codes and enforcement. However, the facts are clear that the plumbing industry has yet to see its proudest moments relating to tap water scald protection. |
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Why Not 120 degrees F Water? The problem today is the same as was reported over 25 years ago--hot water in excess of 120 degrees F. You might ask why we haven't followed this 25-year-old recommendation and adjusted the hot water source to 120 degrees F. There are two reasons why this hasn't happened, and why it probably will not. The first reason is that no one wants to run out of hot water in the shower. Homeowners expect their hot water will be available whenever and for as long as they need it. Running out of hot water is simply unacceptable in most homes. The problem stems from the fact that most common sources of residential hot water heaters are the 40- to 60-gallon type. With this amount of stored hot water, coupled with the normal peak hot water usage, most water heaters are set between 140 degrees F and 160 degrees F. Water temperature of 140 degrees F kills Legionella almost immediately. Therefore, due to our water use patterns and concerns about Legionella, we are left with stored hot water in the scald temperature range. |