PENTAIR · POOL HEATER PARTS

Pentair MasterTemp 400
Parts & Diagrams

Find the right starting point for your repair. Check the equipment model and source edition, select a diagram number and compare the listed replacement parts.

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2025–2026 catalog — water

Pentair MasterTemp 400 manufacturer parts reference — Select a number to find its part, or search the parts list by OEM number. Enlarge the diagram for closely spaced numbers.

Find a part in this revision

#1 400-series tubesheet-coil assembly kit

OEM part number: 474061

Model and source notes

Water diagram PDF16/380; tables16–17/380–381. ASME table entries have no numbered drawing callout. Keep common bypass and ASME new-header contexts separate; old header prior 10/2012 differs from new header10/2012 to Present. Models: 400NA; 400LP. All source parts remain review candidates for the exact installed heater. Raw source labels are not product-code/HIN equivalents. Superscript1 date applicability requires review; no ASME inference. Documented package/BOM context only: water source keys 3. Component membership is not a substitution or sale-pack equivalence. HOLD: catalog footnote says after 11/16/13, ASME table says 11/16/13 to Present, and manual RevQ says after 10/31/2013. Keep each comparator and review boundary units; no date bridge inferred. Source: Pentair 2025-2026 Product Catalog - Heaters & Heat Pumps Parts · Not stated; sec19_rp_heaters_2025-2026.pdf · 2025-2026 edition; Updated June 2025 · 16 · 380 · https://www.pentair.com/content/dam/extranet/nam/pentair-pool/residential/catalogs/2025-pool-product-catalog/low-resolution-pdfs-for-posting-2025-2026-edition/heaters-heat-pumps-2025-2026/sec19_rp_heaters_2025-2026.pdf.

Identify your model and source edition

Manufacturer diagram

Find a part in this revision

#1 400-series tubesheet-coil assembly kit

#1 400 HD tubesheet-coil assembly kit

#2 400-series manifold kit

#2 Basic manifold kit

#3 400-series coil/tubesheet sealing O-ring kit

#8 Manifold bypass-valve kit

#9 Water-pressure switch

#13 Connector-tube O-ring

#14 Connector-tube kit

#15 Thermal-regulator kit

#16 Thermal regulator with spring clip

#20 Heater drain plug

#22 Pressure-relief valve

#23 Two-inch union-adapter package, two adapters

# Water-system O-ring kit

# Water-parts Pro Service package

# Heater accessories and documents bundle

# ASME rodent-resistant manifold insert

# 400 ASME heat-exchanger kit

# 400 ASME HD heat-exchanger kit

# ASME old-header bypass-valve kit

# ASME old-header thermal-regulator kit

# ASME pressure-relief valve kit

# ASME new-header manifold bypass-valve kit

Manufacturer diagram

Find a part in this revision

#1 Combination gas-control valve kit

#2 Three-quarter-inch gas union

#21 Metal vent cover

#22 Heater top

#23 Service-side panel with clips and screws

#24 Manifold-side panel

#25 Heater bottom

#26 Flue-stack side panel

#27 Junction-box cover

#28 Panel hardware kit

# Lower-enclosure insulation

# Metal vent-cover assembly

# Master Pro Service package

# Rodent-resistant air-orifice protection cap

# Rodent-resistant gas-pipe escutcheon

# ASME antirodent manifold insert

#5 400 natural-gas air-blower kit

#5 400 propane air-blower kit

#7 400-series air-orifice kit

#15 One-piece combustion-chamber assembly

#20 One-piece elbow and combustion-chamber cover assembly

#20b Combustion tub O-ring kit

# 400 natural-gas orifice kit

# 400 propane gas-orifice kit

# Blower/adapter-plate gasket kit

# 400-series flameholder kit

# Combustion insulation kit

# NG to Propane Conversion Kit Model400 (Incl. Item Nos.3 and4)

# Propane to NG Conversion Kit Model400 (Incl. Key Nos.3 and4)

#6 Item#6 included in Item#7

Manufacturer diagram

Find a part in this revision

#1 Heater display cover

#2 Igniter bracket

#3 Igniter and igniter-gasket kit

#4 Igniter gasket

#5 Automatic gas-shutoff switch

#6 High-limit switch

#7 Heater thermistor

#8 Heater terminal board

#9 Fireman-switch fuse, 1.25 A and 1-1/4 inch

#10 Ignition control module

#11 Heater transformer, 115/230 V

#12 Air-flow switch

#13 NA/LP-series control-board kit

#16 Stack-flue sensor

# Heater wiring harness, 115/230 V

# 120/240-volt plug kit

# Electrical-parts Pro Service package

# Rodent-resistant exhaust insert

# Rodent-resistant manifold insert