Heres what the manual says for my OWB: Lifetime Limited Warranty
Any stove which is determined to be defective in material or workmanship within the first 6 years and returned to Aqua-Therm, freight prepaid, will be repaired or replaced at Aqua-Therm's option at no charge to you... In years 7 through the life of the product Aqua-Therm will pay a prorated share of any repair or replacement cost..
7th yr-50%
8th yr-45%
9th yr-40%
10th yr-35%
11th yr-30%
12th yr-25%
13th yr-20%
14th yr through 19th yr-15%
20th year and beyond 10%
All components: fans, baffles, pumps, aquastates,relays,gauges,relief valves, expansion tanks, heat exchangers, etc. are warranted by there manfactures.In addition, Aqua-therm warrants the orginal factory installed components for 1 year from date of purchase.
Corrosion inhibitor must be used and maintained for warranty to remain in effect.
Owner's registration card must be completed and returned to Aqua-Therm within 30 days from purchase for warrenty to be in effect.