Question about Rinnai Desa Vent-Free Infrared Gas Heater: Vent-Free Infrared Gas Heater(18,000 BTU)

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Rinnai gas water heater wont heat the water hot enough even though we have turned the thermostat up to 185.

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Your temp control is bad and you will have to have a tech to service the unit, contact rinnai and they will give you info on a quilified repair person,, not just any one should be allowed to work on it,, depending on the age it may still be under warranty,, they come with 5 year parts 1 year labor 12 years on heat exchanger this is on all rinnai units

Posted on Jun 29, 2009

  • gary miller
    gary miller Jul 13, 2009

    are you talking about full water pressure or just like a trickle,, If it is at full pressure you may have to have the circuit board checked to make sure that the thermostat is working properly,, have you had the system flushed out lately,, scales will build up and then you won't get the water hot beings it is heateing the dirt insted of the water, but i would have the thermostat checked first

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