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How do we prevent temperature spikes with our on-demand water heater?

by LiveModern Webmaster last modified Jan 04, 2012 02:08 AM
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by last modified Oct 10, 2011

We have a gas Rinnai on-demand heater in series with a solar hot water system. We purchased the 150K BTU Rinnai because of our low hot water demand. The water temperature spikes when the preheated water reaches the Rinnai, then the Rinnai shuts down. I can understand the shutdown, but how do I deal with the spike to scalding temperature? It makes things uncomfortable in the shower. We tried setting the delivery temperature too.




 

 

We have a gas Rinnai on-demand heater in series with a solar hot water system. We purchased the 150K BTU Rinnai because of our low hot water demand. The water temperature spikes when the preheated water reaches the Rinnai, then the Rinnai shuts down. I can understand the shutdown, but how do I deal with the spike to scalding temperature? It makes things uncomfortable in the shower. We tried setting the delivery temperature too.

You will need to install a Thermostatic mixing valve prior to the fixture and just after the Rinnai flow through hot water heater.

  • This valve will automatically mix cold water with...



 

 

 
 
 
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