NEXUS

NEXUS condensate neutralizers are rated for specific flow rates depending on the model. The tubular-style 11AS-E9-1 is rated at 1.7 gph, while the canister-style 11AS-EW-1 is rated at 1.9 gph. These ratings correspond to the condensate output of typical high-efficiency gas unit heaters. For heaters with higher condensate production, the larger canister-style 11AS-EW-2 provides increased media volume without a published flow rate, but it is compatible with heaters referenced by Grainger part numbers 55GY97 and 55GY98. Always verify that the neutralizer's flow capacity meets or exceeds the heater's maximum condensate output as specified in the heater's technical manual.

Yes, NEXUS PVC concentric vent kits are designed for Category IV venting applications. Category IV appliances are condensing gas heaters with positive vent pressure and flue gas temperatures typically below 140°F (60°C). The kits are constructed from PVC, which is approved for such temperatures and for use with the acidic condensate produced by condensing heaters. The concentric Y configuration provides separate paths for combustion air intake and exhaust flue gases, meeting the requirements for direct-vent installations. Ensure that the vent kit model (11AS-Y2, 11AS-Y3, or 11AS-Y4) matches the heater's vent connection size and that the total vent length does not exceed the heater manufacturer's maximum allowable run.

The primary difference is in form factor and media volume. Tubular-style neutralizers, such as the 11AS-E9-1 and 11AS-E9-2, have a long, narrow cylindrical shape (e.g., 3-1/4 in diameter x 18-7/8 in length) and are designed for installations with limited vertical space or where a compact footprint is needed. Canister-style neutralizers, like the 11AS-EW-1 and 11AS-EW-2, have a wider, shorter body (e.g., 14-1/4 in x 4-3/4 in x 4-3/4 in) and typically contain more neutralizing media, allowing them to handle higher condensate flow rates or longer service intervals before media replacement. Both styles use a neutralizing media (usually calcium carbonate or magnesium oxide) to raise the pH of the condensate to acceptable levels for drain disposal.

NEXUS condensate neutralizers are designed to be compatible with high-efficiency gas wall and ceiling unit heaters, but specific compatibility depends on the heater's condensate connection size and flow rate. The product listings reference compatibility with Grainger part numbers 55GY93 through 55GY98, which correspond to specific unit heater models. For other heater brands, verify that the neutralizer's inlet connection matches the heater's condensate drain outlet (typically 1/2 in or 3/4 in NPT or barbed fitting) and that the neutralizer's flow capacity is adequate. NEXUS neutralizers are generic in design and can be adapted with standard plumbing fittings, but always consult the heater manufacturer's installation instructions for condensate disposal requirements.

The NEXUS condensate pump shelf (model 11AS-K9) is a mounting accessory designed to support a condensate pump when gravity drainage is not possible. In installations where the unit heater is located below the drain line or where condensate must be lifted to a disposal point, a condensate pump is required. The shelf provides a stable platform for the pump, ensuring proper alignment with the heater's condensate outlet and preventing strain on the tubing. It is compatible with high-efficiency unit heaters and is constructed to withstand the weight and vibration of a typical condensate pump. The shelf simplifies installation by eliminating the need for custom brackets or field-fabricated supports.

Yes — 3G Electric (S) Pte. Ltd. supplies NEXUS products. We stock the NEXUS catalog and supply genuine factory-original products with full manufacturer warranty and technical support.