The Ariston Horizontal Flue Kit 60/100 SE (Part No. 3319648) is the standard horizontal coaxial flue kit for the Ariston Next Evo X range of room-sealed instantaneous gas water heaters, including the Next Evo X 11 LPG (3632535) and Next Evo X 16 Natural Gas (3632533). Constructed from stainless steel with a white finish, the 800mm overall length accommodates most standard wall thicknesses for a straightforward through-wall horizontal termination — the most common flue route for multipoint water heater installations in kitchens and utility rooms. It is the current replacement for the earlier Part No. 3318000. The 3319648 is supplied as a complete installation set including all components needed for a standard straight horizontal run.
⚠ Next Evo X Water Heaters Only — Not Compatible with E-Combi ONE Boilers: The 3319648 belongs to Ariston's SE (Standard Efficiency) flue accessory system and is designed exclusively for the Next Evo X gas water heater range. It is not compatible with the E-Combi ONE, Clas ONE, Genus ONE, Alteas ONE, or any other Ariston HE condensing boiler. Those boilers require the HE Ø60/100 coaxial system — Part No. 3318073 (horizontal kit). Using SE flue accessories on an HE boiler is a safety and warranty breach.
⚠ Replaces Part No. 3318000: The 3319648 is the current production replacement for the earlier Ariston horizontal flue kit 3318000. Both are fully compatible with the Next Evo X range. If your documentation, warranty paperwork, or installation manual references 3318000, order the 3319648 as the correct current equivalent.
ℹ What's Included: Coaxial flue pipe (stainless steel, 800mm), 90° adaptor elbow, clamp, seals, and fixing hardware — everything required for a standard straight through-wall horizontal installation.
Stainless Steel — Condensate Resistant
Instantaneous gas water heater flue gases can be mildly acidic, especially at lower firing rates. Stainless steel construction resists corrosion from acidic condensate over the appliance's service life, unlike aluminium or plastic-coated mild steel alternatives that can degrade with extended low-temperature operation.
Complete Installation Set
The 3319648 includes all hardware for a standard straight through-wall horizontal installation — no additional parts needed for a normal run within the kit's 800mm reach. For longer runs, bends, or walls thicker than 800mm, SE flue extensions and elbows are available separately.
Genuine Ariston SE System Accessory
As a genuine Ariston SE system part, the 3319648 is engineered and tested to match the Next Evo X's combustion fan pressure, flue gas temperature, and flow rate. Third-party 60/100 kits with different gasket sizing or wall terminal design may impair combustion performance and CO safety.
| Specifications — 3319648 Horizontal Flue Kit 60/100 SE |
| Part Number |
3319648 (replaces 3318000) |
| Flue System |
SE (Standard Efficiency) Ø60/100 mm coaxial |
| Orientation |
Horizontal — through wall |
| Overall Length |
800 mm |
| Material |
Stainless steel, white finish terminal |
| Compatible Appliances |
Ariston Next Evo X 11 LPG (3632535), Next Evo X 16 Natural Gas (3632533) |
| Not Compatible With |
E-Combi ONE, Clas ONE, Genus ONE, Alteas ONE or any Ariston HE condensing boiler — use 3318073 instead |
| SE Extension Accessories |
3318005 (1m extension), 3318006 (0.5m extension), 3318003 (90° elbow), 3318004 (45° bend pair) |
| Contents |
Coaxial flue pipe, 90° adaptor elbow, clamp, seals, fixing hardware |
Frequently Asked Questions
What is the difference between the SE and HE flue systems?
Ariston produces two distinct coaxial flue families. The SE (Standard Efficiency) system — which includes the 3319648 — is designed for the Next Evo X gas water heaters. The HE (High Efficiency) system — starting with 3318073 horizontal and 3318079 vertical starter — is designed for all Ariston condensing boilers (E-Combi ONE, Clas ONE, Genus ONE, Alteas ONE, etc.). Although both are nominally Ø60/100, the internal geometry, gasket sizing, and terminal design differ between the two. Do not mix SE and HE accessories across different appliance types.
What if my wall is thicker than 800mm or I need to route around an obstacle?
Ariston offers a range of SE flue accessories for extended or redirected runs: 3318005 (1m extension), 3318006 (0.5m extension), 3318003 (90° elbow), and 3318004 (45° bend pair × 2). Each elbow or bend reduces the maximum permissible total flue length — check the Next Evo X installation manual's flue length table for the specific deductions applicable.
Is there a vertical version of this kit for the Next Evo X?
Yes — a vertical flue kit with black terminal (SE) and a matching vertical flue starter (SE) are available separately for Next Evo X installations where vertical roof termination is required. These are different part numbers from the HE vertical starter (3318079) and HE vertical flue kits (3318080, 3318081) — do not interchange between SE and HE systems.
I have an E-Combi ONE boiler — which horizontal flue kit do I need?
For the E-Combi ONE (and all other Ariston HE condensing boilers), you need the HE horizontal kit — Part No. 3318073 (standard horizontal, 1000mm), or the 3318074 bundle (horizontal kit + vertical starter together). The 3319648 SE kit in this listing is not suitable for any Ariston boiler.
