Twenty four inches of service clearance in front and two inches on the back and sides is recommended for gas water heaters whereas electric heaters do not require minimum clearance.
Clearance for electric hot water heater.
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A clearance area of 12 inches is required on all sides of a hot water heater.
Water heaters require clearance in front of them at the service side also.
A water heater supported from the ground shall rest on level concrete or other approved base extending not less than 3 above the adjoin ing ground level.
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A certain amount of airflow is also required for proper combustion and ventilation.
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2010 cpc 508 3 water heaters installed in attics must have adequate support for the weight of the water heater.
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Unlike other heating devices electric heaters do not require a minimum clearance.
Bottom boards are a buffer made of r 10 or better thermal resistant material that increase the efficiency of your electric heater.
A gas water heater needs a 30 inch by 30 inch area per international residential code irc m1305 1 2 and an electric water heater has the same 30 inch by 36 inch requirement as an an electrical panel per national electrical code nec 110 26 a.
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However many electrical equipment codes do recommend the provision of a 30 inch working space on the front and sides of the heater to allow for examination adjustment or maintenance of the electrical equipment.
The building code states that.
Bottom board electric water heaters require insulation when placed in an unheated area to prevent heat loss.