Wednesday, October 28, 2009

Z-Flex 3" Termination Options for Bosch 2700ES/2400ES Tankless Water Heaters

We stock the full line of Z-Flex Z-Vent 3" and 4" stainless steel vent pipe. There are a variety of termination options for both the 3" and 4" venting.

All of our termination pieces come with a built-in bird screen to ensure that birds and other critters cannot get into your venting system.

The AQ3ES Side Wall Vent Kit for the Bosch 2700ES and 2400ES tankless water heaters comes with the 3" Termination Box with a 10" sleeve (2SVSTB03). This special OEM part is exactly the same as the Z-Flex part 2SVSRTF03. The 2SVSTB03 and the 2SVSRTF03 can both also be used for intake air.

If you have vinyl siding then you do not want to use the 2SVSTB03 or 2SVSRTF03 Termination Box as the hot exhaust gases may melt your vinyl siding. The recommended part for vinyl siding is the 3" Termination Hood (2SVSHTX03). This part can also be used for intake air.

We also sell the 3" Termination Hood with Damper (2SVSHTD03), but this part is not approved for either the Bosch 2700ES or Bosch 2400ES tankless heaters. The concern is that if the damper gets frozen shut then the exhaust gases cannot escape. The 3" Termination Hood with Damper cannot ever be used for intake air!

We carry the 3" Termination Coupling (2SVSTPF03). This will exhaust the gases straight out from your house, so safety is a concern when using this part for exhaust. This part can be used for either exhaust or intake.

The 3" Termination Tee (2SVSTTF03) exhausts the gases out in two directions. This part can also be used for intake air.

The 3" Termination Elbow (2SVSTEX0390) will shoot the exhaust gases out in a single direction. This part can also be used for intake air.

The Z-Flex Z-Vent 4" stainless steel vent pipe part numbers are as follows:
  • 4" Termination Box 2SVSRTF04
  • 4" Termination Hood 2SVSHTX04
  • 4" Termination Hood with Damper 2SVSHTD04
  • 4" Termination Coupling 2SVSTPF04
  • 4" Termination Tee 2SVSTTF04
  • 4" Termination Elbow 2SVSTEX0490

Monday, October 19, 2009

Noritz 0751 Series Residential Tankless Water Heater

Today we received a call from a customer who was looking for 4" stainless steel vent pipe for his Noritz 0751 Series Residential Tankless Water Heater.

Noritz VT4-TL Sealed Combustion Long Vent TerminationHe wanted to purchase Z-Flex vent pipe and wanted to know the correct venting adaptor for this heater. He also wanted to know how to connect the Z-Flex exhaust to his Noritz VT4-TL Sealed Combustion Long Vent Termination.

The correct Z-Flex adaptor for the Noritz 751M-DV tankless water heater is the 4" Noritz Adaptor (2SVWA04). This adaptor connects directly to the heater and allows you to exhaust with Z-Flex 4" stainless steel vent pipe.

The Z-Flex Stainless Steel Vent Pipe connects directly to the Noritz VT4-TL Sealed Combustion Long Vent Termination.


Thursday, October 15, 2009

ESHCK Concentric Vent Kit for Bosch 2700ES / 2400ES

Bosch has recently approved the ESHCK Concentric Vent Kit for the Bosch AquaStar 2700ES, 2400ES and 715ES tankless water heaters.

The ESHCK side wall concentric vent kit is actually a shell piece of stainless steel venting that will work with vent pipe manufactured by Z-Flex, ProTech Industries or Heat-Fab. (Of course, we always recommend using Z-Flex stainless steel AL29-4C vent pipe.)

Part number ESHCK is a 5" diameter shell through which you can stick a 3" x 3' piece of stainless steel vent pipe. This piece of straight pipe is terminated by either a Termination Tee or a Termination Elbow. The ESHCK shell that fits around this straight pipe creates the air intake vent pipe.

The air intake from the Bosch 2700ES, 2400ES or 715ES tankless water heater can be run using PVC and connects directly to the ESHCK. The air intake port on the ESHCK can be rotated 360 degrees around the ESHCK to bring the combustion air in from any angle. Bosch recommends that you bring the air in from the top, particularly in areas that are prone to freezing.

The ESHCK is actually 20" long, but when you stick the 3" x 3' pipe and the termination piece through the ESHCK then the total length of the ESHCK Vent Kit is about 41" long. When you add the required 3" x 90 degree elbow the total length is about 47" long. The square flashing that rests against the outside wall is 8" square.

Bosch requires that the termination tee or termination elbow be a full 12" away from your exterior wall. This is meant to ensure that the exhaust air does not get recylcled back through the air intake. Don't go beyone the 12" either as this may increase your potential for condensation in the exposed pipe section.

We sell a complete kit called the ESHCK-FULL-KIT Concentric Vent Kit that includes the ESHCK shell, a 3" x 90 degree elbow, a 3" x 3' stick of pipe and a termination tee.

Please note that this concentric vent kit will protrude quite a bit through the inside wall making it very difficult for you to mount the tankless water heater on the same wall that you are venting out of. The easiest way to use this ESHCK concentric vent kit is to mount your tankless water heater on a wall that is perpendicular from the wall that you are venting out of.

With this configuration, you will need a 90 degree elbow coming off of your water heater. Then we recommend using a horizontal drain pipe to catch any condensate that gets generated. Then you may need additoinal straight pipe to connect up to the ESHCK concentric vent kit which protrudes from the wall.

If you do want to do and "up and out" venting through the same wall you mount the heater on with the ESHCK then you will need to install your 2700ES or 2400ES tankless water heater out away from the wall. This will help you avoid using an excessive number of 90 degree elbows.

One of the big advantages of using the ESHCK concentric vent kit is that you only have to have a single hole through your exterior wall. This may greatly reduce your installation costs if you have a difficult wall to drill through, such as a thick stone wall.

Another advantage of using the concentric vent kit is that for some installations it is impossible to meet the 3' distance requirement between the exhaust and the air intake.

Aesthetically it may also be more desireable to have a single vent through your outside wall.

Please see the Bosch 2700ES Installation Manual or the 2400ES Installation Manual for the full details of installing the ESHCK Concentric Vent Kit.