/
/
Parts town. Get real parts faster

Shopping Cart

Skip to NavigationSkip to Content
Loading...
Loading...
CAD
Multi-SKU Order
LoginRegister
Parts town. Get real parts faster

Find Equipment Manuals

Loading...
Loading...

Reznor B 400 Parts & Manuals

Manufacturer:

Model #:

Reznor

B 400

Unit Heater

Unit Heater

get special offers & news from parts town

800.239.5152
Loading...
Loading...
visa
visa
mastercard
mastercard
american-express
american-express
discover
discover
paypal
paypal
© 2026 Parts Town. All rights reserved.
Loading...
visa
visa
mastercard
mastercard
american-express
american-express
discover
discover
paypal
paypal

Stock Up on Real OEM HVAC Parts for the Summer Season! SHOP NOW

Call: 800.239.5152
Hvac Parts
TECHTOWN
Track My Order

Important Update: Click here for the latest information on tariffs and their impact on our industry.

Help Desk

  • Contact Us
  • Shipping
  • Taxes And Fees
  • Returns
  • FAQ

Inside Parts Town

  • About Us
  • Careers
  • Our Difference
  • Resource Center
  • Parts Town Blog
  • techtown
  • International

Technology and Innovations

  • Parts Town App
  • Serial Number Lookup
  • Smart Manuals
  • Website Features
  • Terms of Use
  • Privacy Policy
  • Privacy Request
  1. Home
  2. /
  3. Reznor
  4. /
  5. B 400
Parts Town Logo

1-Hour Pickup Available

Part Category

  • Baffles(7)
  • Bearings & Bushings(2)
  • Belts, Pulleys & Sheaves(10)
  • Brackets & Retainers(9)
  • Burners(3)
  • Capacitors(2)
  • Caps & Plugs(3)
  • Catches, Latches & Strikes(1)
  • Clamps & Clips(1)
  • Contactors(7)
  • Controls(3)
  • Conversion Kits(2)
  • Decals, Labels & Overlays(2)
  • Disconnects, Couplings & Collars(1)
  • Fan & Blower Motors(6)
  • Fan Blades & Blower Wheels(3)
  • Filters, Screens & Driers(6)
  • Fuses, Blocks & Holders(6)
  • Holders & Supports(4)
  • Hoses, Pipes & Tubing(3)
  • Ignition Modules(2)
  • Ignitors & Electrodes(1)
  • Inserts & Frames(1)
  • Nuts, Bolts & Screws(21)
  • Orifices(2)
  • Panels, Covers & Lids(15)
  • Pilot Burners(2)
  • Pumps & Motors(16)
  • Relays(10)
  • Rods, Shafts & Pins(1)
  • Shields & Guards(5)
  • Springs(1)
  • Switches & Buttons(3)
  • Terminal Blocks(2)
  • Thermocouples & Thermopiles(1)
  • Thermostats & High Limits(7)
  • Transformers(8)
  • Valves, Solenoids & Fittings(8)
  • Washers, Rings & Spacers(4)
  • Wires, Cables & Hardware(10)
Cool,Calm and Collected- Real OEM HVAC Pars Are in Season! SHOP NOW

Part Category

  • Baffles(7)
  • Bearings & Bushings(2)
  • Belts, Pulleys & Sheaves(10)
  • Brackets & Retainers(9)
  • Burners(3)
  • Capacitors(2)
  • Caps & Plugs(3)
  • Catches, Latches & Strikes(1)
  • Clamps & Clips(1)
  • Contactors(7)
  • Controls(3)
  • Conversion Kits(2)
  • Decals, Labels & Overlays(2)
  • Disconnects, Couplings & Collars(1)
  • Fan & Blower Motors(6)
  • Fan Blades & Blower Wheels(3)
  • Filters, Screens & Driers(6)
  • Fuses, Blocks & Holders(6)
  • Holders & Supports(4)
  • Hoses, Pipes & Tubing(3)
  • Ignition Modules(2)
  • Ignitors & Electrodes(1)
  • Inserts & Frames(1)
  • Nuts, Bolts & Screws(21)
  • Orifices(2)
  • Panels, Covers & Lids(15)
  • Pilot Burners(2)
  • Pumps & Motors(16)
  • Relays(10)
  • Rods, Shafts & Pins(1)
  • Shields & Guards(5)
  • Springs(1)
  • Switches & Buttons(3)
  • Terminal Blocks(2)
  • Thermocouples & Thermopiles(1)
  • Thermostats & High Limits(7)
  • Transformers(8)
  • Valves, Solenoids & Fittings(8)
  • Washers, Rings & Spacers(4)
  • Wires, Cables & Hardware(10)
Cool,Calm and Collected- Real OEM HVAC Pars Are in Season! SHOP NOW

Reznor RZ257472 Ignition Conversion Kit, JC to UTC Nonlock

Reznor
  • Mfr Part # RZ257472
  • Parts Town # REZRZ257472
  • Quantity12

In Stock, Ships today

Reznor RZ045602 High Limit Switch, Auto Reset, L180-60F

Reznor
  • Mfr Part # RZ045602
  • Parts Town # REZRZ045602
  • Quantity25

In Stock, Ships today

Reznor 255350 Thermostat, Heating/Cooling, Wall Mount, 50-90F, 10-30C

Reznor
  • Mfr Part # 255350
  • Parts Town # REZ255350
  • Quantity4

In Stock, Ships today

Reznor RZ082414 Energy Cutout Limit Control

Reznor
  • Mfr Part # RZ082414
  • Parts Town # REZRZ082414
  • Quantity10

In Stock, Ships today

Reznor RZ121275 Limit Switch, Manual Reset, Block Vent

Reznor
  • Mfr Part # RZ121275
  • Parts Town # REZRZ121275
  • Quantity8

In Stock, Ships today

Reznor 96360 Pilot/Thermocouple Assembly, Natural

Reznor
  • Mfr Part # 96360
  • Parts Town # REZ96360
  • Quantity7

In Stock, Ships today

Reznor 177398 Gas Valve, Propane, 2 Stage, 24V, 1/2" x 3/4"

Reznor
  • Mfr Part # 177398
  • Parts Town # REZ177398
  • Quantity3

In Stock, Ships today

Reznor 216386 Contactor, 3 Pole, 24VAC 50/60HZ Coil, 25 FLA

Reznor
  • Mfr Part # 216386
  • Parts Town # REZ216386
  • Quantity3

In Stock, Ships today

Reznor 259521 Relay, Time Delay/Sequencer

Reznor
  • Mfr Part # 259521
  • Parts Town # REZ259521
  • Quantity7

In Stock, Ships today

Reznor 221525 Gas Valve, Natural, 24V, 3/4" x 3/4"

Reznor
  • Mfr Part # 221525
  • Parts Town # REZ221525
  • Quantity4

In Stock, Ships today

Reznor 123974 Fan Control Switch/Thermostat with Bracket, F135-30F

Reznor
  • Mfr Part # 123974
  • Parts Town # REZ123974
  • Quantity3

In Stock, Ships today

Reznor 131988 Transformer, 120 to 24V, 12VA, 50/60HZ

Reznor
  • Mfr Part # 131988
  • Parts Town # REZ131988
  • Quantity3

In Stock, Ships today

Reznor 257010 Ignition Control Module with Lockout, Intermitten Pilot, 60 Minute Retry

Reznor
  • Mfr Part # 257010
  • Parts Town # REZ257010
  • Quantity2

In Stock, Ships today

Reznor 100502 TOP AIR BAFFLE B/BE250-400

Reznor
  • Mfr Part # 100502
  • Parts Town # REZ100502
  • Quantity0

Out of stock, but not out of mind! Place your order now and we'll get it to you ASAP.

Reznor 100503 ADAPTER BAFFLE B/BE250-400

Reznor
  • Mfr Part # 100503
  • Parts Town # REZ100503
  • Quantity0

Out of stock, but not out of mind! Place your order now and we'll get it to you ASAP.

Reznor 100504 VEE BAFFLE B/BE400

Reznor
  • Mfr Part # 100504
  • Parts Town # REZ100504
  • Quantity0

Out of stock, but not out of mind! Place your order now and we'll get it to you ASAP.

Reznor 100507 VERTICAL BAFFLE B/BE400

Reznor
  • Mfr Part # 100507
  • Parts Town # REZ100507
  • Quantity0

Out of stock, but not out of mind! Place your order now and we'll get it to you ASAP.

Reznor 100508 VERTICAL SIDE BAFFLE B/BE400

Reznor
  • Mfr Part # 100508
  • Parts Town # REZ100508
  • Quantity0

Out of stock, but not out of mind! Place your order now and we'll get it to you ASAP.

Reznor 100969 FRONT FLUE BAFFLE B400

Reznor
  • Mfr Part # 100969
  • Parts Town # REZ100969
  • Quantity0

Out of stock, but not out of mind! Place your order now and we'll get it to you ASAP.

Reznor 100977 REAR FLUE BAFFLE B400

Reznor
  • Mfr Part # 100977
  • Parts Town # REZ100977
  • Quantity0

Out of stock, but not out of mind! Place your order now and we'll get it to you ASAP.

Reznor 101263 POLYTUBE HOLES LOC DWG

Reznor
  • Mfr Part # 101263
  • Parts Town # REZ101263
  • Quantity0

Out of stock, but not out of mind! Place your order now and we'll get it to you ASAP.

Reznor 101798 PLASTIC DART PC47307EVZ

Reznor
  • Mfr Part # 101798
  • Parts Town # REZ101798
  • Quantity0

Out of stock, but not out of mind! Place your order now and we'll get it to you ASAP.

Reznor 102243 RELAY BRACKET ASSEMBLY CL31

Reznor
  • Mfr Part # 102243
  • Parts Town # REZ102243
  • Quantity0

Out of stock, but not out of mind! Place your order now and we'll get it to you ASAP.

Reznor 103183 #6X1 HEX WASHER SLOT TS B ZINC

Reznor
  • Mfr Part # 103183
  • Parts Town # REZ103183
  • Quantity0

Out of stock, but not out of mind! Place your order now and we'll get it to you ASAP.

123