Difference between Raypak Low Nox and Standard Natural Gas Heaters 406AEN & 407AEN in 2020


New member
Oct 14, 2020
long island, new york
Is there a difference between the 406A and the 407A for natural gas in terms of their function, durability, energy consumption, noise? If they around the same price why wouldn't I buy the one that emits less greenhouse gas? Am I right to assume that the standard models either function better or less expensive which is why both models are still in production?

It seems from earlier posts that Raypak is clearly the favorite brand for heaters. In 2020 is there any other brand heater I should consider besides Raypak for a 400,000+ BTU model?