Product Overview

The Raypak 018759F Bypass Assembly Kit is a genuine OEM 105°F Unitherm Governor (UG) bypass assembly designed for compatible Raypak gas pool and spa heaters in the 206-268 size range.

The bypass assembly regulates water flow through the heater's heat exchanger while responding to water temperature. Proper operation helps maintain the correct internal temperature, supports efficient heat transfer, and helps protect the heat exchanger from condensation and thermal stress.

Key Features

105°F Unitherm Governor Bypass Assembly
Uses a temperature-responsive Unitherm Governor system designed to regulate heater bypass flow at approximately 105°F.

206-268 Heater Application
Raypak specifies 018759F for compatible heater models in the 206/207 and 266-268 size ranges.

Genuine Raypak OEM Part
Factory-authorized replacement assembly manufactured for proper fit and operation in compatible Raypak heaters.

Controls Internal Water Flow
Directs the appropriate amount of circulating water through the heat exchanger based on operating conditions.

Heat Exchanger Protection
Helps maintain proper heat exchanger temperature and reduce issues associated with excessively cold inlet water.

Benefits

• Genuine Raypak OEM replacement
• Complete UG/bypass service assembly
• Factory-rated 105°F operation
• Helps maintain proper heater water flow
• Supports consistent heat-transfer performance
• Helps reduce heat exchanger condensation
• Protects against improper internal bypass operation
• Designed for professional heater repair and maintenance

Specifications

Installation Information

Installation requires access to the heater's inlet/outlet header and internal bypass components.

Before servicing:

• Disconnect electrical power
• Shut off the gas supply
• Turn off the circulation pump
• Allow the heater to cool
• Relieve water pressure
• Drain the heater as required

Inspect the header, bypass components, seals, O-rings, and surrounding parts during replacement. Any damaged or deteriorated sealing components should be replaced before the heater is returned to operation.

Professional installation by a qualified pool-heater service technician is recommended.

Confirm Before Ordering

Raypak 018759F is the 105°F UG/bypass assembly specified for compatible:

• 206A / 206-series heaters
• 207A / 207-series heaters
• 266A / 266-series heaters
• 267A / 267-series heaters
• 268A / 268-series applications where specified

Raypak's current service documentation groups the applications as 206-207 and 266-268.

For larger heater sizes, do not assume the same assembly is used. Raypak specifies 018758F as the 105°F UG service kit for compatible 336-337 and 406-408 applications.

Always verify the heater model, serial number, production date, and existing bypass assembly before ordering.

Warranty Information

The Raypak 018759F is a genuine factory-authorized replacement component. Exact warranty duration and eligibility are subject to Raypak's current replacement-part warranty terms, proof of purchase, installation requirements, and applicable exclusions.

Customer Q&A

Q: What temperature is the 018759F bypass assembly rated for?
Raypak identifies it as a 105°F UG service kit.

Q: What heater sizes use the 018759F?
It is specified for compatible 206-207 and 266-268 heater applications.

Q: What does the bypass assembly do?
It regulates internal water flow through the heat exchanger based on temperature to help maintain proper heater operating conditions.

Q: Does it fit Raypak 336 or 406 heaters?
Not as the standard current 105°F service kit. Compatible 336-337 and 406-408 applications use Raypak 018758F.

Q: Is this an OEM Raypak part?
Yes. The 018759F is a genuine Raypak OEM replacement assembly.