The code specifically requires that water heaters be strapped or anchored to resist horizontal displacement from earthquake motion.
California law regarding water heater straps.
The required clearances from a wall to the heater as stated on the unit nameplate are critical.
Earthquake straps areas prone to earthquakes and some that are not will require the water heater to be strapped in place to prevent damage during a quake.
All water heaters must be strapped in at least two locations.
In 1989 the state legislature established the following health and safety standards.
Every water heater sold in the state of california must be braced.
The upper one third of the unit and the lower one third.
A the legislature finds and declares that there exists a serious threat of fire explosion or electrocution to the people of california from water heaters that overturn or experience damage to the plumbing or electrical wiring during an earthquake and that a large number of structures will suffer damage from water heaters due to the lack of adequate strapping or bracing.
2 manufacturers of water heaters must provide.
The lower strap must be a minimum of 4 above the water heater control unit.
Producers of water heaters must offer clear instructions for installation with seismic straps to be included with each unit sold.
At a minimum any water heater shall be secured in accordance with the california plumbing code or modifications made thereto by a city county or city and county pursuant to section 17958 5.
A the legislature finds and declares that there exists a serious threat of fire explosion or electrocution to the people of california from water heaters that overturn or experience damage to the plumbing or electrical wiring during an earthquake and that a large number of structures will suffer damage from water heaters due to the lack of adequate strapping or bracing.
507 3 support of appliances.
According to california law all new water heater installations must have these straps as well as all existing ones at the time of property sale.