I've finally decided this year to bite the bullet and get a new heater for the pool. I'm going with a Raypak NG 200k BTU model with electronic ignition. There are 2 models i'm looking at and didn't really know the difference in the Low Nox version vs the regular version. Links below...
www.poolsupplyunlimited.com
www.poolsupplyunlimited.com
I also will need to put this under my deck. I know that's not the recommended place, but it's really the only place I have to put it. Any drawbacks other than venting? I can vent the heater out the side of the deck easily.

Raypak Digital Natural Gas Pool Heater 200k BTU Electronic Ignition | P-M206A-EN-C 009962 | P-D206A-EN-C 009994 | P-R206A-EN-C 009216
Efficient? You bet. Energy-smart Raypak heaters consistently achieve the highest efficiency ratings and the Raypak Digital is no exception.

Raypak Digital Low NOx Natural Gas Heater 207k BTU | P-M207AL-EN-C 009990 | P-D207A-EN-C 010022 | P-R207A-EN-C 009240
Raypak is a leader in the industry for both residential and commercial pool and spa applications. Complies with most NOx requirements.
I also will need to put this under my deck. I know that's not the recommended place, but it's really the only place I have to put it. Any drawbacks other than venting? I can vent the heater out the side of the deck easily.