Pentair 474061 Tube Sheet Coil Assembly Kit — 400K BTU MasterTemp & Max-E-Thermostat, After 1/12/09 — Genuine OEM
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The Pentair 474061 Tube Sheet Coil Assembly Kit is the genuine OEM heat exchanger for 400,000 BTU MasterTemp and Sta-Rite Max-E-Therm pool and spa heaters manufactured after 1/12/2009. It replaces a leaking, corroded or damaged tube sheet coil and restores proper heat transfer.
⚠️ Check Your Heater's Build Date First
This kit fits only heaters built after 1/12/09 (new tub design). For 400K heaters built before that date, the correct part is 77707-0234. The two are not interchangeable — check the date on your heater's rating plate before ordering.
Key Features
- Genuine Pentair OEM: Correct fit and geometry for the post-2009 tub design.
- 100% copper tube sheet: Used in models 460736, 460737, SR400NA and SR400LP.
- Complete service kit: Includes copper tube sheet assembly, ignitor, insulation kit, tube of silicone and o-ring set.
- Natural gas and propane: Fits both 400NA and 400LP configurations.
- Restores efficiency: A corroded heat exchanger wastes fuel and can leak pool water into the combustion chamber.
Specifications
- Part Number: 474061
- Type: Tube sheet coil assembly kit (heat exchanger)
- Capacity: 400,000 BTU
- Material: 100% copper
- Fits: MasterTemp 400NA, 400LP; Sta-Rite Max-E-Therm SR400NA, SR400LP — built after 1/12/09
- Heater Models: 460736, 460737
- Includes: Tube sheet assembly, ignitor, insulation kit, silicone, o-ring set
- Pre-2009 Equivalent: 77707-0234
- Cupro-Nickel HD Version: 77707-0244
- Brand: Pentair (Genuine OEM)
Frequently Asked Questions
How do I know if my heater is before or after 1/12/09?
Check the manufacturing date on the rating plate. If it predates 12 January 2009, you need 77707-0234 instead. If you are unsure, the serial number will tell you — confirm before ordering, since this part cannot be returned once fitted.
Does this fit a 300K or 333K heater?
No. This is the 400K assembly. The post-2009 300/333K version is 474060.
What symptoms indicate a failed heat exchanger?
Water leaking into the combustion chamber, rising copper levels in your pool water, visible corrosion on the tubes, or a heater that fires but will not hold temperature.
Is this copper or cupro-nickel?
Copper. Salt pools and heavy chemical environments often specify the cupro-nickel HD version, 77707-0244.
Who should install it?
A qualified pool heater technician. The job involves gas and combustion components and requires the heater to be fully depressurised and disconnected.
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?
Pentair lists this heater component under part number 474061. Quote 474061 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 Pentair 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 Pentair manufacturer warranty. The terms are set by Pentair, 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.