1:5:10:365 EcoTip Blog

November 11, 2008

316: Scald Prevention

Take the 1:5:10:365 challenge: Do one thing – for 5 to 10 minutes – 365 days a year to make our home and planet environment better.

1:5:10:316 EcoTip: Install a scald prevention system. This allows your hot water heater to operate at a high enough temperature to prevent Legionella pneumophilia from growing in your hot water system, but automatically mixes cold water to a preset temperature for safety. A scald prevention valve at each hot water fixture then acts as an extra safety device to shut-off the water flow as a fail- safe should the temper valve stop working.

anti_scald_domesticTemper valve

 

***********************************

 Additional Information:

Suggested Review: :146

Anti-scald devices are now required by U.S. law in all new plumbing installations. An anti-scald device shuts the water off when the temperature exceeds 120°F (49°C) but it doesn’t temper the water temperature. This means that in the U.S. the water heater is frequently used to keep the temperature low. 

Lower temperatures save energy and help prevent scalds but they may also lead to the growth of Legionella pneumophilia  in the hot water heater. These conflicting issues are discussed in :146.

According to the Washington based National Coalition to prevent childhood injury tapwater scald injuries are the second most common cause of serious burn injuries and are responsible for over 100 deaths a year in the United States (mostly children under 5 and elders over 65)

According to the Austrailian green plumbing firm Highlander Plumbing the following regulations apply in Austrailia (but the information is valid anywhere):

AS 1056.1
With reference to clause 3.2.2 the thermostat for a storage water heater shall be set at not less than 60°C. This clause then explains that a minimum setting of 60°C is specified on the advice of the Department of Health, NSW, that bacteria Legionella pneumophillia do not survive in temperatures above 55°C.

AS 3500.4
With reference to Clause 1.10.2, Part B, all new hot water installations shall deliver hot water not exceeding 50°C in residential buildings, at the outlet of all sanitary fixtures used primarily for personal hygiene purposes.

Here are the facts:…

  • at 50°C, a deep scald takes 5 minutes in an adult or child;
  • at 54°C, a deep scald takes 35 second in an adult and 10 seconds for a child;
  • at 60°C, a deep scald takes 6 second for an adult and 1 second for a child;
  • at 65°C, 2 seconds for an adult and 0.5 seconds for a child;
  • at 70°C, in a typical factory setting – 1 second for an adult.

Tempered water is compulsory on all new residential developments in NSW. You cannot simply turn the heater down or you will breed Legionella. The tank must stay hot, but the water coming out must be tempered down.

*A tempering valve has on average a 5yr lifespan and cannot be serviced. We recommend replacement after 5 yrs. This valve is a safety valve and cannot be serviced. If the valve fails to operate it is to be replaced.

Would you like to receive an email alert for each new 1:5:10:365 EcoTip? Sign up for a Google Alert.

Advertisements

July 26, 2008

:208 Bacteria in Water Heater

Welcome to today’s 1:5:10:365 Tip for becoming a better steward for our home and planet environment.

1:5:10:208 EcoTip:If the rotten egg smell is coming from your hot water, it is likely your water heater is contaminated with bacteria that are producing the rotten egg – sulphur odor. This generally involves several considerations which with be covered in the 1:5:10:365 EcoTips for the next several days.

***********************************

 Additional Information:

Suggested Review: :203

Would you like to receive an email alert for each new 1:5:10:365 EcoTip? Sign up for a Google Alert.

June 9, 2008

:161 Instant Water Heater

Filed under: :161 Instant Water Heater — Tags: , , , , , — John Banta @ 12:01 am

Welcome to today’s 1:5:10:365 Tip for becoming a better steward for our home and planet.

1:5:10:161 EcoTip: Consider an instant water heater for your kitchen sink or other hot water supplies especially if they are located a distance from the tank hot water heater. The hot water they deliver saves on energy and you don’t waste water letting it run down the drain while it heats up.

***********************************

 Additional Information:

Would you like to receive an email alert for each new 1:5:10:365 EcoTip? Sign up for a Google Alert.

 

Blog at WordPress.com.