On Demand Water Heaters

By Robert Robillard on Bathrooms

Using an On Demand Water Heater in conjunction with water saving plumbing fixtures

Dear Concord Carpenter,
Your article, Water Saving Plumbing Fixtures,  reminded me of something my mother was told recently.
She has been investigating options for a new heating & hot water system and was told that on-demand hot water heater wouldn’t work well in her house due to all the water saving devices she has installed.   She was told that on-demand water heater  works best with regular water use.
Do you know why that is?
It seems like a poor state of affairs to have to choose between energy efficiency and water conservation. Maybe this would be a good topic for a follow-up article.
Westford, MA

Dear Holly,

It can be a conflicting problem & solution.

Depending on the On-Demand Water Heater model, other piping, fixtures, and other miscellaneous characteristics of one’s system…..most of these water heaters require a minimum of a .5 GPM of flow (1/2 gallon of water passing through the heat exchanger) to turn on the appliance.

Sometimes water saving devices can cause problems with On Demand Water Heaters. But many of these water heaters will work if you research the specifications of minimum water flow needed to turn on the appliance.

Hope this helps!



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About the author

Robert Robillard

Carpenter / Remodeler / Editor

Rob Robillard is “The Concord Carpenter” Rob is a builder, general contractor, carpenter, woodworker, and editor of Concord Carpenter and ToolBoxBuzz As a General Contractor and carpenter, Rob owns and operates Concord Carpenter LLC. A full-service remodeling and construction company. Rob is a recognized leader in home building best practices and a source for how-to information for building professionals. On this website, Rob covers all aspects of home construction, building science, home improvement, woodworking, remodeling, and some of the best product and tool reviews. Rob is in charge of our Tool and Product Review series - Concord Carpenter Videos where we post all of our tool reviews and video tutorials. Rob approaches remodeling and building construction with a pragmatic and problem-solving approach. He enjoys using his knowledge and experience to help and educate building professionals as well as DIYers on best practices in the construction and remodeling industry. He's a strong advocate for "raising the bar" in the construction trades and promoting the trades to youth. #BeAMentor #Green2Great Craftsmanship, quality, and pride guide his journey on this channel The Concord Carpenter's motto: "Well done is better than well said!" : Read more about Rob

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