From an inspection on Saturday. Tempstar model NUKK075DG05
Unit had been installed as propan in 1991 and converted to natural gas in 1992. The third pic says a secondary heat exchanger was installed in 2003.
Do any of the HVAC guys here know if this unit came with a secondary heat exchanger originally? (it is apparently a 90+ furnace from my research)
The unit is rated 75K BTU L.P. and only 60K BTU for the alternate fuel which I assume is Natural gas. Is that correct?
(Most of the converted units I have seen don’t have this much difference between the two possible fuel sources and when I converted my own boiler I was suppied with a new rating decal for the new fuel source. N.G/L.P.
Thanks in advance for any enlightening comments.