Is it possible for a new NG heater to be less efficient?

BurninMoney

Active member
Jul 5, 2017
26
Fort Worth, TX
I had a Sta-Rite 400k BTU NG heater. It died and got replaced with a Hayward low nox NG heater - same BTU.

I could be wrong but it seems like the new one is more expensive to operate than the old one. Is that possible?

I live in Texas where it’s hot right now, and it’s easy to see in NG gas bills the difference between last year and this year - absent any other impacting factors like home central heat. Running the heater for the spa seems to cause a greater impact on the NG bill than normal.

Thoughts?
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
29,167
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
Both the Sta-Rite NG heater and the Hayward low nox NG heater are 84% efficient. They should use the same amount of gas.

Whatever is going on to raise your gas bill is external to the heater.
 

PoolGate

Gold Supporter
TFP Guide
Jun 7, 2017
6,503
Damascus, MD
Pool Size
29000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Jandy Aquapure 1400
If you ever measured the actual gas usage of the old heater you could compare it to the new heater (gas usage per hour). There will be small variances but should not be huge difference. How much is the difference?
 
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