Mark I will.........You have a heater that runs for 5 mins and uses 199000 btu's and you have another heater that takes several minutes to fire and only uses 38000 btu's...........that's where the savings are. Told you the numbers can be manipulated. :laughing::laughing:
Having already established through the previous posts that most buy not on conservation, I don't understand why everyone seems to be focusing on that aspect. Maybe someone can clue me in on that?
I am now curious as to just why they have an energy star rating and a tank heater does not. So based on what I do know I would like to see exactly what they do use compared to a tank type.
A pretty common heater is a NR 98. 199 k btu is the max output based on it's full rated load of 9.8 gpm @ 35 degree rise. It's minimum btu output is 12 k btu. It has a manifold with 3 independent solenoids that open based on the demand and which automatically adjusts the manifold output pressure of the gas based on the load. It comes on only when needed and has an 84% thermal rating (the new condensing models are 93%). Most tank heaters are 60-ish% thermal efficiency rating. One comes on only when needed and the other sporadically depending on location. Most garages get pretty cold though and will make it come on mire often than a heated location.
Somebody be a gentleman and oblige me with some good solid physics that will make the 38k btu tank more efficient than the tankless at 38k btu output in this scenario. Better yet, make it raise 9.8 gallons 35 degrees in one minute. ......