Raypak 009836 Outdoor Stack Kit (High Wind Top) with Inner Adapter Panel, 8" Flue, for 336A and 337A Pool Heaters

Raypak's manuals call this the outdoor stack kit, and it is sold as the high wind top. These heaters come with a stackless outdoor top, and Raypak lists the outdoor stack as optional equipment. The stack is the vent termination, so no vent pipe is added to it.

Model notes: 336A digital (electronic ignition) heaters; 337A digital Low NOx heaters (Raypak dates the residential 337A to 2004 through 2023); 336A millivolt heaters (built 2004 to 2020). Other cabinet sizes take a different kit: 009834 for the 206A and 207A, 009835 for the 266A, 267A and 268A, 009837 for the 406A, 407A and 408A.

• In the box, per Raypak: 1 painted outdoor stack, 1 adapter plate, 3 mounting brackets (clips), 1 top panel cover, two 1 ft sections of metal tape, 3 screws and the instructions
• Sized for the 8 in. (203 mm) flue of the 336A and 337A
• Stack height, per Raypak's dimension note: the heater's J dimension plus 6 in. (152 mm). J is 10-5/8 in. (270 mm) on the 336A and 337A
• Clearance above: Raypak calls for unobstructed space over an outdoor stack
• Optional equipment: Raypak does not supply it with the heater

For outdoor installations only. A heater installed indoors needs the indoor stack kit (009840 for this size) and a vent to the outside.

Raypak's Digital Tool Box Guide lists high wind among the things to check when the rollout switch opens, and wind as a probable cause of ignition failures and lockouts. It lists other causes as well (gas pressure, combustion air, a blocked heat exchanger, vent size and connections) and does not name this kit as the remedy.

Follow the instructions packed with the kit. Work on a gas heater's venting is for a qualified installer.