Hi, how different from 407A ?
Ruud 406A Digital Natural Gas Heater 399K BTU, P-D406A-EN-C 010001
To install 406A, plumbing need ?
100% compatible?
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Open Feb 04, 2026 - 09:51 AM
1answer
Answer
Feb 04, 2026 - 09:51 AM
The 406A is the standard 399,000 BTU digital natural gas heater, while the 407A is the Low NOx (lower-emissions) version designed to meet stricter air-quality rules in certain areas (ex. California). Little to no plumbing changes needed
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