Bock Approves PolyPro Single-Wall, Flex, and Concentric for High-Efficiency Water Heaters

Date: May 02, 2014

Adobe Acrobat Document Press Release

Vacaville, CA - M&G DuraVent announced that it has obtained a key approval for PolyPro Venting Systems. PolyPro rigid pipe, flex pipe, and fittings have been approved for use on Bock’s optiTHERM models: OT200, OT250, OT299, OT300, OT400, and OT500. Bock also approves the use of PolyPro 3PPS-VK or 3PPS-HK concentric vent kits on the OT200, OT250, and OT299 series, and 4PPS-VK or HK concentric vent kits for the OT300, OT400, and OT500 series.

When using the PolyPro venting system, the vent pipe requirements stated in the unit installation instruction – minimum & maximum vent lengths, termination clearances, etc. – apply and must be followed. Follow instructions provided with PolyPro’s venting system where applicable or if requirements are more restrictive. The only exception to the venting requirements in the water heater manual applies to the OT200, OT250, and OT299 series.

About M&G DuraVent
M&G DuraVent is a recognized technological leader in the venting industry. All M&G companies, including DuraVent, exclusively develop, manufacture and market a wide range of flue and vent products in aluminum, stainless steel and plastic for the HVAC and hearth industry. M&G is the largest supplier of engineered venting systems for the high-efficiency heating market in Europe for 20 years. For more information, please visit

About Bock
Bock Water Heaters, Inc. manufactures water heaters designed to operate on any fuel (solar, geothermal, natural gas, propane, oil and electricity) and offers a large portfolio of indirect water heaters and storage tanks. For more information, please visit

To learn more about this approval, please contact
M&G DuraVent
Tim Rothgeb, VP of Commercial and OEM Sales
Office: (800) 835-4429