AO Smith has expanded the ability to common vent its Cyclone water heater up to three heaters. Now a common vent kit is available to manifold the venting on up to three BTH-120, BTH-150, BTH-199, BTH-250, BTH-300, BTH-400, or BTH-500. Click on the AO Smith website at http://www.hotwater.com/water-heaters/commercial/water-heaters/gas/cyclone/cyclone-mxi/ or email us for additional details.
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