Raypak | 009843 | Millivolt Plus Natural Gas Pool Heater – 266K BTU (P-R266A-MN-C #52)
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The Raypak 009843 Millivolt Plus Natural Gas Pool Heater (P-R266A-MN-C #52) delivers dependable 266,000 BTU heating performance with the advantage of millivolt operation, allowing the heater to run without external electrical power. This makes it an ideal solution for pools in areas prone to power outages or installations where electricity is unavailable.
Built with Raypak’s proven engineering, this heater features polymer headers for corrosion resistance and a copper heat exchanger for fast, efficient heat transfer. Its compact footprint, quiet operation, and durable construction make it a trusted choice for residential pool owners seeking consistent, low-maintenance heating.
Raypak 009843 Millivolt Plus Natural Gas Pool Heater (P-R266A-MN-C #52) Compatibility
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Designed for residential inground pools and spas
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Operates on natural gas
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Requires no external electrical power (millivolt system)
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Compatible with standard pool plumbing connections
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Suitable for installations without automation or electrical access
Frequently asked questions
How do I size a pool heater?
Heater sizing follows pool surface area, the temperature rise you want and how exposed the pool is to wind. A larger BTU rating heats faster and cycles less; an undersized heater runs continuously and still struggles on cold nights. Gas heaters also need a gas line and meter capacity that can supply their rated input.
What is the part number for this heater component?
Raypak lists this heater component under part number 009843. Quote 009843 when you cross-reference against your equipment manual, an existing part, or a parts diagram, so you are comparing the same revision.
What routine maintenance does a pool heater need?
Keep water chemistry balanced, because low pH and high calcium hardness are the two most common causes of premature heat exchanger failure. Beyond that: keep the cabinet clear of debris, check for rodent nests before each season, and have the burner and gas train inspected periodically.
How do I confirm this fits my equipment?
Match the part number stamped on the component you are replacing, or look it up in the parts list for your Raypak equipment. If your model or serial number is not named on this page, send it to us before you order and we will confirm the fit.
Is this the complete heater or a replacement part?
Check the title and the specification section above. Heater listings and heater component listings share the same part-number format, so confirm whether you are buying a full appliance or a single serviceable component before ordering.
Is there a warranty on this heater component?
It carries the standard Raypak manufacturer warranty. The terms are set by Raypak, and on some equipment the coverage only applies when a licensed professional performs the installation. Keep the receipt and packaging until you have confirmed correct operation.