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Why do I get very little pressure at my fixtures when I turn on the hot water?

Having low pressure?

This could be that the incorrect size tankless unit was installed for your application. Tankless water heaters are installed based upon the peak demand2 in an application. Also you will get less hot water flow in the winter than in the summer, due to the reduced inlet water temperature. When sizing a tankless water heater use the worst case temperature rise1 for your region along with peak demand2.

A local Noritz service representative can be located at: http://support.noritz.com/servicereplocator.php

Temperature Rise1
The difference between the set temperature of the tankless heater and the ground water temperature (e.g. 120 Fahrenheit setting – 60 Fahrenheit ground water = 60 degree Fahrenheit rise.)

peak demand2
the largest gallon per minute flow rate experienced by a plumbing system during normal operation

Applicable Models

  • Models: ALL MODELS
Updated on April 17, 2021

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