Raypak 010083F Front & Rear Refractory Kit (Firebox Insulation Blocks) – For Select 406A/407A Heaters The Raypak 010083F is a replacement front and rear refractory kit used to line and protect the heater firebox. These refractory blocks help shield internal metal surfaces from direct flame and extreme heat, supporting proper combustion heat containment and reducing the risk of hot spots caused by cracked or missing refractory. Key Details Part Number: 010083F Type: Front & rear refractory block kit (firebox liner/insulation) Function: Protects the firebox area and helps maintain proper heat containment Typical Compatibility: Commonly listed for Raypak 406A / 407A heater families (verify by model/serial and parts diagram) Common Reasons to Replace Refractory is cracked, broken, heavily eroded, or missing pieces Heater was disassembled for major service and refractory needs replacement Visible heat damage or hot spots in the firebox area What’s Included Front refractory block(s) Rear refractory block(s) Components included may vary by manufacturer packaging; verify kit contents for your specific heater revision Compatibility Notes Refractory kits are model-specific. Confirm your heater model (and whether it is standard vs. Low NOx) before ordering. Always match by Raypak model/serial and the heater’s parts breakdown to ensure correct fit. Related Products Search: Raypak Refractory Kits Search: Raypak 406A Parts Search: Raypak 407A Parts Search: Raypak Burner Tray / Burner Parts Search: Raypak Heater Gaskets Search: Raypak Igniters / Flame Sense Parts Shop: Raypak Installation & Maintenance Tips Turn off gas and power before opening the heater cabinet. Allow the unit to cool completely. Handle refractory carefully—these parts can crack if dropped or forced into place. Clean out debris (scale, rust flakes, soot) before installing new refractory so it seats properly. If you see repeated cracking, inspect for airflow/combustion issues (blocked openings, improper draft, or improper gas/air mix). Keep the heater area clear of leaves and dust; restricted airflow can increase heat stress in the firebox.
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