What does the Rinnai V1500 factory default temperature setting look like?
The factory default temperature settings for the V1500 model can be set to either 50°C or 55°C, with a preference of 50°C due to safety regulations and the ability to fine-tune this via Water Controllers up to 4°C higher if necessary. (Page 23)
From the official Rinnai V1500 manual, page 19
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