Stainless Steel Boiler Venting - In Stock, ready to ship!

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18" Double Wall Stainless

This diameter of double wall boiler venting is a Special Order and requires a 3-4 week production time.
Please call us at 1-800-561-9135 or 903-484-4808

  1. 18" Stainless Steel Universal Appliance Adapter Sale
    $225.92 $282.39
    Appliance adapters are used to connect your tankless water heater, boiler, or commercial boiler to the proper diameter of z-flex / z-vent al29-4c stainless steel vent pipe. Most tankless water heaters and boilers require an appliance adapter.
  2. 18" Single Wall To Double Wall Adapter Sale
    $423.25 $529.07
    • Simple gasketed connection - no sealant needed
    • Highest pressure rating in the industry
    • The only metallic special gas vent you can cut to length on site
    • New fusion welded pipe seams for a smoother finish and better fit
    • Compatible with all types of Z-Flex Z-Vent

    This pipe is rated: AL29-4C : UL1738 : Category II, III, and IV.
    All Z-Vent pipe comes with a limited lifetime warranty.
  3. 18 in. X 6 in. Double Wall Stainless Steel Vent Pipe Sale
    $274.54 $343.18
    • Simple gasketed connection - no sealant needed
    • Highest pressure rating in the industry
    • The only metallic special gas vent you can cut to length on site
    • New fusion welded pipe seams for a smoother finish and better fit
    • Compatible with all types of Z-Flex Z-Vent

    This pipe is rated: AL29-4C : UL1738 : Category II, III, and IV.
    All Z-Vent pipe comes with a limited lifetime warranty.
  4. 18" X 12 in. Double Wall Stainless Steel Vent Pipe Sale
    $373.31 $466.63
    • Simple gasketed connection - no sealant needed
    • Highest pressure rating in the industry
    • The only metallic special gas vent you can cut to length on site
    • New fusion welded pipe seams for a smoother finish and better fit
    • Compatible with all types of Z-Flex Z-Vent

    This pipe is rated: AL29-4C : UL1738 : Category II, III, and IV.
    All Z-Vent pipe comes with a limited lifetime warranty.
  5. 18" X 18 in. Double Wall Stainless Steel Vent Pipe Sale
    $532.32 $665.40
    • Simple gasketed connection - no sealant needed
    • Highest pressure rating in the industry
    • The only metallic special gas vent you can cut to length on site
    • New fusion welded pipe seams for a smoother finish and better fit
    • Compatible with all types of Z-Flex Z-Vent

    This pipe is rated: AL29-4C : UL1738 : Category II, III, and IV.
    All Z-Vent pipe comes with a limited lifetime warranty.
  6. 18" x 24 in. Double Wall Stainless Steel Vent Pipe Sale
    $698.06 $872.57
    • Simple gasketed connection - no sealant needed
    • Highest pressure rating in the industry
    • The only metallic special gas vent you can cut to length on site
    • New fusion welded pipe seams for a smoother finish and better fit
    • Compatible with all types of Z-Flex Z-Vent

    This pipe is rated: AL29-4C : UL1738 : Category II, III, and IV.
    All Z-Vent pipe comes with a limited lifetime warranty.
  7. 18" X 36 in. Double Wall Stainless Steel Vent Pipe Sale
    $1,044.57 $1,305.71
    • Simple gasketed connection - no sealant needed
    • Highest pressure rating in the industry
    • The only metallic special gas vent you can cut to length on site
    • New fusion welded pipe seams for a smoother finish and better fit
    • Compatible with all types of Z-Flex Z-Vent

    This pipe is rated: AL29-4C : UL1738 : Category II, III, and IV.
    All Z-Vent pipe comes with a limited lifetime warranty.
  8. 18" x Adjustable Length Double Wall Stainless Steel Vent Pipe Sale
    $698.06 $872.57
    • Simple gasketed connection - no sealant needed
    • Highest pressure rating in the industry
    • The only metallic special gas vent you can cut to length on site
    • New fusion welded pipe seams for a smoother finish and better fit
    • Compatible with all types of Z-Flex Z-Vent

    This pipe is rated: AL29-4C : UL1738 : Category II, III, and IV.
    All Z-Vent pipe comes with a limited lifetime warranty.
  9. 18" X 90 deg Double Wall Stainless Steel Elbow Sale
    $959.20 $1,199.00
    Solid, non-adjustable
    Not compatible with other brands of vent pipe
    No sealant required
    AL29-4c Stainless Steel
    Underwriters Laboratories listed UL1738
    Approved for Category I, II, III ,IV Appliances
  10. 18" x 45 deg Double Wall Stainless Steel Elbow Sale
    $678.21 $847.77
    Solid, non-adjustable
    Not compatible with other brands of vent pipe
    No sealant required
    AL29-4c Stainless Steel
    Underwriters Laboratories listed UL1738
    Approved for Category I, II, III ,IV Appliances
  11. 18" x 30 deg Elbow -Double Wall Sale
    $678.21 $847.77
    Solid, non-adjustable
    Not compatible with other brands of vent pipe
    No sealant required
    AL29-4c Stainless Steel
    Underwriters Laboratories listed UL1738
    Approved for Category I, II, III ,IV Appliances
  12. 18" x 15deg Elbow- Double Wall Sale
    $678.21 $847.77
    Solid, non-adjustable
    Not compatible with other brands of vent pipe
    No sealant required
    AL29-4c Stainless Steel
    Underwriters Laboratories listed UL1738
    Approved for Category I, II, III ,IV Appliances
  13. 18" Double Wall Tee Sale
    $887.22 $1,109.03
    • Simple gasketed connection - no sealant needed
    • Highest pressure rating in the industry
    • The only metallic special gas vent you can cut to length on site
    • New fusion welded pipe seams for a smoother finish and better fit
    • Compatible with all types of Z-Flex Z-Vent

    This pipe is rated: AL29-4C : UL1738 : Category II, III, and IV.
    All Z-Vent pipe comes with a limited lifetime warranty.
  14. 18" Boot Tee-Double Wall Sale
    $1,263.38 $1,579.22
    A Boot Tee is designed to allow a low flow resistance connection of horizontal and vertical sections. A Tee Cap or Tee Cap with Drain is available and sold separately.

    AL29-4c Stainless steel
    UL listed: UL1738 Category 1, 11, 111 and 1V Approved
  15. Z-Vent Tee Cap Sale
    $183.82 $229.78
    • Attaches to either a Straight Tee or Boot Tee.
    • Stainless Steel AL29-4c
    • Category 1,11,111,1V Approved
  16. Z-Vent Tee Cap with Drain Sale
    $248.14 $310.18
    • Attaches to the bottom of either a Straight Tee or Boot Tee.
    • Stainless Steel AL29-4c
    • Category 1,11,111,1V Approved
    • Hi-Temp Condensate hose sold separately
  17. 18" Double Wall Stainless Steel Vertical Drain Tee Sale
    $1,135.37 $1,419.21
    All Z-flex condensation drains allow for the proper draining of condensation from the vent pipe run, thus preventing damage to your boiler.

    * Hi-Temp starter condensate hose sold separately
  18. 18" Double Wall Horizontal Drain Pipe Sale
    $1,135.37 $1,419.21
    All Z-flex condensation drains allow for the proper draining of condensation from the vent pipe run, thus preventing damage to your boiler.

    * Hi-Temp starter condensate hose sold separately
  19. 18 in. Stainless Steel Vertical In-line Drain Sale
    $601.72 $752.15
    This condensate drain should be installed closest to the heater in a vertical position. 7 3/4" height.

    * Hi-Temp starter condensate hose sold separately
  20. 18" Double Wall Stainless Steel Rain Cap Sale
    $541.66 $677.08
    This rain cap is to be used in conjunction with a storm collar and roof flashing for vertical installations of the z-flex stainless steel pipe.
  21. 18" Stainless Steel Storm Collar Sale
    $228.65 $285.81
    his storm collar is to be used in conjunction with a rain cap and roof flashing for vertical installations of the z-flex stainless steel pipe.

    Z-Flex Hi-Temp RTV sealant required for installation. Sold separately.
  22. Z-Vent Guy Band Sale
    $36.74 $45.93
    • Simple gasketed connection - no sealant needed
    • Highest pressure rating in the industry
    • The only metallic special gas vent you can cut to length on site
    • New fusion welded pipe seams for a smoother finish and better fit
    • Compatible with all types of Z-Flex Z-Vent

    This pipe is rated: AL29-4C : UL1738 : Category II, III, and IV.
    All Z-Vent pipe comes with a limited lifetime warranty.
  23. 18" Stainless Steel Roof Flashing 0/12- 6/12 Pitch Sale
    $436.87 $546.09
    This roof flashing is to be used in conjunction with a storm collar and rain cap for vertical installations of the z-flex stainless steel pipe. To be used on roofs 0/12 to 6/12 pitch.

    *Not for installation on Corrugated Roofs
  24. 18" Stainless Steel Roof Flat Flashing Sale
    $417.82 $522.27
    This roof flashing is to be used in conjunction with a storm collar and rain cap for vertical installations of the z-flex stainless steel pipe. To be used on flat roofs.

    *Not for installation on Corrugated Roofs
  25. 18" Galvanized Wall Thimble 4-7 in Sale
    $402.52 $406.59
    Width adjusts from 4" to 7" for typical through-the-wall applications.

    Dimensions: 30" x 30" square
  26. 18" Galvanized Fire Stop Support Sale
    $261.05 $263.69
    • Simple gasketed connection - no sealant needed
    • Highest pressure rating in the industry
    • The only metallic special gas vent you can cut to length on site
    • New fusion welded pipe seams for a smoother finish and better fit
    • Compatible with all types of Z-Flex Z-Vent

    This pipe is rated: AL29-4C : UL1738 : Category II, III, and IV.
    All Z-Vent pipe comes with a limited lifetime warranty.
  27. 18 in. Termination Box Sale
    $367.46 $459.33
    Termination options are required for your venting run. Termination pieces will be the final piece on the outside of your structure to properly vent exhaust away from the structure and prevent foreign objects and rain from entering the pipe run.

    AL29-4c Stainless Steel
    Underwriters Laboratories listed UL1738
    Approved for Category I, II, III ,IV Appliances
  28. 18" Base Support Sale
    $313.03 $391.29
    Base supports are designed to support the vent pipe and to maintain proper clearance to combustibles.
  29. Z-Vent Wall Support Sale
    $440.95 $551.19
    Wall supports help support long runs of pipe along a wall.
  30. 18" Clamp Support-DW Sale
    $102.73 $128.41
    The Support Clamp is used to support the weight of the vent pipe. It clamps around the pipe and then use cable to secure to the ceiling or roof. ( 1/8" to 1/4" cable and cable hardware not included )

    Recommended installation:

    Vertical installations use the Support Clamp every 5 feet when installing Single or Double wall Z-Vent pipe

    Horizontal installations, install the Support Clamp every 5 feet when using Single wall Z-Vent and every 3 feet when using Z-Vent Double wall vent pipe.

    Made of 304 Stainless Steel
  31. Silicone Compound Sale
    $25.28 $31.60
    Apply to each Z-Vent gasket to simplify joining pipe.

    Tacky, non-melting and water resistant Silicone based.

    Also resistant to moisture,corrosion and oxidation.

    5.3oz. in squeeze tube

    Approx. 18 month shelf life

    * Do not use a petroleum based product ( WD40, Petroleum Jelly or Vaseline) on the Z-Vent gaskets. It will degrade the gaskets.
  32. HI-TEMP Sealant -3 OZ. Sale
    $16.36 $20.45
    Z-Flex Hi-Temp sealant 3 ounces

    Temperature range -62 to +500 F

    Generally used inside the Storm Collar to prevent rain water from trickling down the outside of the vent pipe.

    *Not needed for joining pipe.
  33. Condensate Drain Tube Starter Hose 36" With Clamp Sale
    $30.94 $38.67
    Hi-Temp condensate starter hose. 3/8" id x 36"

    Rated at 480 degrees
    Resistant to acidic condensation ( low PH) from boiler exhaust
    *Installed Condensate Hose must be looped in a knot and filled with water to allow condensate to drain without allowing carbon monoxide gas to escape.
    Installed length is about 20 inches long after putting the hose in the required loop.
  34. Condensate Drain Tube Hose 10ft. Sale
    $85.48 $106.85
    Hi-Temp condensate. 3/8" id x 10ft.

    Rated at 480 degrees
    Resistant to acidic condensation ( low PH) from boiler exhaust
    *Installed Condensate Hose must be looped in a knot and filled with water to allow condensate to drain without allowing carbon monoxide gas to escape.
    Does not include clamp
  35. Condensate Drain Tube Hose 25ft. Sale
    $213.70 $267.12
    Hi-Temp condensate. 3/8" id x 25ft.

    Rated at 480 degrees
    Resistant to acidic condensation ( low PH) from boiler exhaust
    Does not include clamp
  36. Condensate Drain Tube Hose 50ft. Sale
    $427.39 $534.24
    Hi-Temp condensate. 3/8" id x 50ft.

    Rated at 480 degrees
    Resistant to acidic condensation ( low PH) from boiler exhaust
    Does not include clamp
  37. Condensate Drain Tube Hose 100ft. Sale
    $854.78 $1,068.48
    Hi-Temp condensate. 3/8" id x 100ft.

    Rated at 480 degrees
    Resistant to acidic condensation ( low PH) from boiler exhaust
    Does not include clamp