Saturday, February 20, 2010

Selkirk 5 Inch Type B Venting Double-Walled Galvanized

GlobalTowne stocks 5" Selkirk Metalbest Type B Double-walled Galvanized vent pipe for the Bosch AquaStar 1600H and 1600P tankless water heaters.

The Selkirk Metalbestos 5" Type B vent pipe will connect up directly with the 1600H and 1600P tankless hot water heaters and will also connect up directly with the Bosch H/P VVT vertical vent kit.

The Bosch H/P VVT vertical vent kit contains all of the venting parts needed to vent the Bosch 1600H and 1600P heaters through the roof except for the straight pipe.

Our customers have found that ONLY the Selkirk Metalbest vent pipe will mate up with the H/P VVT vent kit piping, so this is the 5" Type B venting that we stock.


Monday, February 8, 2010

Z-Vent Installation Tips and Hints

GlobalTowne is one of Z-Flex's largest distributors in the US. We carry all of the Z-Flex Z-Vent stainless steel vent pipe that is needed to exhaust tankless water heaters and boilers.

Here are some generic Z-Vent Installation Tips and Hints directly from the vendor:
  1. A venting system that exits the structure through a sidewall or the like, shall terminate not less than 12 inches (254 mm) above the ground.
  2. The termination of a system shall be located above the snow line in geographical areas where snow accumulates. The termination area should be kept clear of snow and ice at all times.
  3. The vent shall not terminate less than 7 ft. (2.13 m) above a paved sidewalk or driveway.
  4. The termination shall be 6 ft. (1.8m) or more from the combustion air intake of any appliance.
  5. The system shall terminate more than 3 ft. (.91 m) from any other building opening, gas utility meter, service regulator or the like.
  6. Exterior mounted venting systems should be enclosed below the roof line with a chase to limit condensation and protect against mechanical failure.
Always refer to your tankless water heater or boiler's Installation Manual as their requirement may differ from these Z-Vent Tips.

Saturday, February 6, 2010

AE 115 and AE 125 Heaters and control

Many times we have been asked if the Bosch AE115 and Bosch AE125 can accept pre heated water. The answer is no.

The reason lies in how the unit controls the temperature. These large KW whole house tankless water heaters are designed to take cool water and heat the water to shower temperature as the water passes through the heater. The heater turns on as flow is detected and turns off when the water flow ceases.

There is a temperature sensor on the inlet water pipe (cold) and a sensor on the outlet pipe (hot). The switch that turns the heater on is a solid state style switch or SCR switch. This type of switch has no moving parts and is very reliable. However, SCR or solid state switches generate heat as they switch electrical current. To cool these switches, they have been located on the inlet (cold) water inlet. So the copper pipes act as a heat sink for the SCR switches. If hot water is passed through the pipes and the heater turns on the SCR switches could over heat and FAIL.

Call us for any applications involving the need to have pre-heated water through a tankless heater. We can provided gas and electric heaters for floor heating or other applications needing to circulate warm or hot water.


Thursday, February 4, 2010

Pipe Cover Kit (AQPCES) for AquaStar 2700ES / 2400ES

The Pipe Cover Kit (AQPCES) for the Bosch AquaStar 2700ES / 2400ES tankless water heaters is a cosmetic case that is installed directly below the tankless water heater. It covers the water and gas pipes from view.

This pipe cover kit will also work with the Bosch ProTankless Models: GWH 715 ES, GWH C 800 ES, GWH C 920 ES, GWH C 920 ESC.

Please review the AQPCES Installation Manual for more details.