Technical Articles

FAQ - Why does it take so long for the hot water to get to the fixture?

A tankless water heater produces hot water almost instantly at the heater, but it may take a while to travel to your fixtures.  Cold water in the piping must be emptied before you will feel the hot water produced by the tankless heater.  Longer, larger diameter pipes have more water volume than shorter, smaller pipes therefore take longer to empty.  Poor insulation may also increase hot water wait times since the water is cooled as it travels through the piping.  In order to reduce the wait time for hot water, recirculation systems and on-demand pumps may be used. 
Recirculation systems require a dedicated recirculation line and pump in order to operate.  A pump pushes water around this loop ensuring the water is already heated in your piping.  These systems require additional energy to heat the recirculation line and will typically be more costly to operate.  In order to reduce the heater operation time, we recommend using a aquastat and timer to control the pump (consult your plumber for more information).  The main advantage of this system is "instant" hot water delivery to all fixtures in your home.
On-Demand pumps are installed underneath the sink and pump hot water directly to a specific fixture.  These systems are easier to install than recirculation systems and typically cost less (due to reduced material and labor costs.)  They do not produce "instant" hot water and typically require activation either by a push button or motion sensor.  Their main advantages come in reducing wait time for hot water and wasted water down the drain.

Applicable Models
  • Models: ALL MODELS
There are no attachments for this article.
Comments Comments
Please add a comment if you would like to provide us with feedback about this article. We will carefully analyze your feedback and use it to improve our Articles, but we will not reply to you. If you have an issue that requires a reply, please click here to contact us. If you have an urgent matter that needs immediate assistance, please call us at 866-766-7489. Otherwise, please feel free to search our website for what you need. Thank you for choosing Noritz!

Related Articles

There are no articles in this section.

Articles in same category

FAQ - How to clean inlet filter
Viewed 8091 times since Wed, Feb 22, 2012
FAQ - What maintenance is recommended?
Viewed 6885 times since Fri, Sep 30, 2011
FAQ - How do I flush the heat exchanger?
Viewed 51501 times since Fri, Sep 30, 2011
Article Rating (4 Votes)
Rate this article

Subscribe to Knowledgebase

Get notified when Knowledgebase articles are added or updated.
Get notified when Knowledgebase articles are added or updated.
Copyright © 2011, NORITZ AMERICA CORP.All Rights Reserved