How To Look At A House

McGarry and Madsen's home inspection blog for buyers of  

site-built, mobile/manfuactured and modular homes

Does a tankless (on-demand) water heater require a shut-off valve?

Saturday, December 11, 2021

Yes, the International Residential Code requires a cold water shut-off valve at all water heaters (IRC 2903.9.2). It must be a full-open valve and readily accessible. Also, manufacturers recommend installation of a shut-off at the outlet (hot) piping too, as part of an isolator valve “flush kit” (example shown below).  

    For more details, go to Does a water heater need a shut-off valve? and Why should a tankless water heater have an isolator/service valve kit installed?

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Here’s a few other articles about tankless water heaters: 

Does a tankless gas water heater still work with no electricity during a power outage? 

What is the average life expectancy of a tankless water heater?

Does a tankless water heater require a pressure relief valve?

Does a tankless water heater in an attic require a drain pan? 

What is the minimum clearance to doors and windows for an outdoor tankless gas water heater?

    Visit our WATER HEATERS page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.

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