I have a one year old rinnai R94Lsi tankless unit. I've recently done Co readings at the termination with one faucet running, and the CO reading was at 55ppm. Firing rate for the one faucet was about 90,000 BTU's. The more taps i open, my CO readings would go up. What would cause higher than normal CO readings? Any thoughts or opinions on this unit?
Also have a York high. eff. 2 stg furnace with variable speed motor. Any opinion on this unit or servicing problems others have had with it? Would be interested..