A Better Way to Heat Water 

NAECA Guidelines

2015 NAECA

Energy Factor Regulations

Rated Gallon Capacity NAECA 2015 Electric NAECA 2015 Gas
30 0.95 0.63
40 0.95 0.62
50 0.95 0.60
60 1.99 0.75
66 1.98 0.75
75 1.97 0.74
80 1.97 0.74
100 1.94 0.72
120 1.92 -

Note: For gas-fired units, NAECA applies only to gas-fired storage heaters below 75,000 BTUs and tankless water heaters below 200,000 BTUs.

Tankless NAECA Minimum Efficiency Standards will remain at the previous rating of .82 EF for all gas tankless units under 200,000 BTUs of input.