Rinnai HOTFLO Questions & Answers

We also had nothing but trouble. If it is under 12 months old I suggest contacting place of purchase as it should be under warranty and/or contact email given above. We had our Rinnai replaced with a Thermann and have had no troubles since. Good luck hope you can get it sorted soon I know how horrible it is to have no hot water, especially as it approaches winter.

Sorry dont know about that model.
With mine -
Battery - The Rinnai idiots designed it with one "D" size battery - not enough - should be designed with 2 so more reliable like my chinese "camping" HWS - finally found a battery good enough and it lights everytime.
Gas - make sure the regulator fitted to the HWS is not too resrictive - If there is an adjustment on the regulator like mine then open it up and try it.
Flow - make sure the flow is consistently over 4 litres a minute - get a bucket (10 litres) and see how much of it gets filled in a minute.
If flow is to slow - remove flow restrictors on shower heads and taps (plastic fittings on the end of taps - for shower heads usually where the shower head connects to the wall).
I considered buying a non-instant model - as there is no delay with heating the water.

IF totally buggered it should be under warranty (1300555545 Rinnai serv no at least in WA)
ours is working ok now that we turned the water flow & temp adj clockwise to decr water flow AND my plumber removed the Govt required Temp Limiting device which most plumbers say is the problem if water not hot enough/( nanny state... put in.so babies dont get scalded)
ps..when my solar panel rebate finishes in 4 yrs, I'll be cutting off all gas to house, buying the biggest storage batt & solar hot water elec boosted)

We have since got it working 95% of the time - we had to completely open up the gas regulator which the manual says must be installed (plumber showed me how) and we have to be very careful of air bubbles inside the hot water system (requires draining of the HWS on the inlet side to try and fix). Also I highly recommend removing any flow restrictors on any taps/shower heads You want to ensure your water is flowing at more than 4 litres per minute. I did this by placing a bucket under the outlet, turn on hot water only and see how much water goes into it over a minute - a bucket is usually about 10 litres. You need 4 litres for the HWS to attempt to warm the water. The Temp limiting device might be a factor if there is air bubbles in the HWS - however we still have ours as set up and in summer the water is hot, in winter it is just warm, we are considering setting up a pre-heater for the water before next winter.