Pool or spa water heater

Liquid heaters and vaporizers – Water tube – Wall structure

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Details

122367C, 122DIG13, 126344, 126350R, 165177, 165185, 237 8C, F22B 1500, F22B 2500

Patent

active

045012326

ABSTRACT:
A pool or spa water heater comprises:

REFERENCES:
patent: 2476666 (1949-07-01), Keller
patent: 3134366 (1964-05-01), Miller
patent: 3741169 (1973-06-01), Johnson
patent: 3800748 (1974-04-01), Schindler et al.
patent: 4023557 (1977-05-01), Thorne et al.
patent: 4031862 (1977-06-01), Smith
patent: 4054174 (1977-10-01), Haller
patent: 4300275 (1981-11-01), McLaughlin

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