Bosch Aquastar 2400 ES Replacement Parts

Globaltowne carries all of the Bosch Aquastar 2400ES replacement parts.  We are an Authorized Bosch Distributor and also carry the full line of all Bosch Gas and electric tankless water heaters.  The Bosch 2400 ES replacement parts are also good for the Bosch Therm 830ES.  Below are some of the parts listed for the Bosch Aquastar 2400ES:

Control Unit:  #87387083840 (Also known as: 8 738 708 384 0)
Heat Exchanger:  #87387019850 (Also known as: 8 738 701 985 0)
Ignition Group: #87013022490 (Also known as: 8 701 302 249 0)
Primary Fan: #87072040710 (Also known as: 8 707 204 071 0)
Backflow Temperature Sensor: #87072064590 (Also known as: 8 707 206 459 0)
Secondary Fan - NG: #87072040940 (Also known as: 8 707 204 094 0)
Secondary Fan - LP: #87072040720 (Also known as: 8 707 204 072 0)
Gas Valve: #87070210190 (Also known as: 8 707 021 019 0)
Water Valve w/Engine: #87085050230 (Also known as: 8 708 505 023 0)
Exhaust Collar: #87055041620 (Also known as: 8 705 504 162 0)
Air Intake Collar:  #87055041160 (Also known as: 8 705 504 116 0)
Wall Mounting Bracket (No part number)

For further questions or to order any parts for the Bosch 2400ES please call Globaltowne at 888-726-9752.

Bosch Therm 830ES/940ES/940ESO Gas Tankless Water Heaters

GlobalTowne has just added the Bosch 830ES, 940ES and 940ESO units to our website. The Bosch Therm 830ES and 940ES replaces the older retail units Bosch 2400ES and Bosch 2700ES. The 830ES and 940ES are direct replacements for the older 2400ES and 2700ES.  the only difference is the part number.  The Bosch Therm 940ESO is an outdoor unit and comes with the Bosch Therm Outdoor Kit (BTOK). Below are more specifications on the heaters and a link to them off our website.

Bosch Therm 830ES
175,000 BTU
Comes in either Natural Gas (NG) or Liquid Propane (LP)
Good for 2 applications at a time
3/4" water/gas connections
Venting is 3" single wall stainless steel
Energy Factor .83
Weight 67 lbs
Size 30.5 x 17.875 x 11.25

Bosch Therm 940ES
199,000 BTU
Comes in either Natural Gas (NG) or Liquid Propane (LP)
Good for 2-3 applications at a time
3/4" water/gas connections
Venting is 3" single wall stainless steel
Energy Factor .83
Weight 67 lbs
Size 30.5 x 17.875 x 11.25

Bosch Therm 940ESO (Outdoor Unit)
199,000 BTU
Comes in either Natural Gas (NG) or Liquid Propane (LP)
Good for 2-3 applications at a time
3/4" water/gas connections
Comes with BTOK for outdoor installation
Energy Factor .83
Weight 72 lbs
Size 30.5 x 17.875 x 11.25

Please call GlobalTowne at 888-726-9752 for further questions or to place an order.

Bosch External Water Filter

The Bosch external water filter part number 8703305356 replaces the existing smaller internal water filter screen inside certain Bosch tankless water heaters.  The external water filter allows for easy access to clean the inlet screen periodically.  Without the external water filter it is very difficult to get at the inlet screen inside the heater.  The Bosch external water filter is designed to be used for Bosch models 250SX/2400E/2400ES/2700ES.  The Bosch Integra 500/Evolution 500/2400ES/2700ES came with the external water filter.

The Bosch external water filter was also good for the older model Bosch heaters such as the older 635ES/635ESO/830ES/940ES/940ESO/C800ES/Therm C950ES/Therm C1050ES and C1210ES/C1210ESC

All of the newer model Bosch tankless water heaters 830ES/940ES/Greentherm C950ES/Greentherm C1050ES/ C1210ES/C1210ESC have the built in inlet filter screen.  See image below as it shows the inlet filter screen where the cold water connection is.

Replacing a Bosch Aquastar 125FX with a Bosch Therm 830ES

The older Bosch Aquastar model 125FX came in either Natural Gas (NG) or Liquid Propane (LP) and was 117,000 BTU and was a direct vent unit that was good for one major application at a time.  The 125FX had electronic ignition and was fan-assisted and took its combustion air from the room it was installed in.  The heater had a built-in fan so the heater could be vented right out the sidewall of the building.  The Aquastar 125FX had to be vented with 4" sealed stainless steel venting going a maximum of 15' out the sidewall of the building into the FXHood.  The FX Hood was a termination hood specifically designed for the 125FX and had a built-in flapper to keep cold air from penetrating the vent pipe and freezing the heater.  The Bosch Aquastar 125FX is discontinued now and has not been made for over 8 years or so.  One of the closest replacement models for the 125FX would be the new Bosch Therm 830ES.

Bosch Therm 830ES

The new Bosch 830ES comes in either Natural Gas (NG) or Liquid Propane (LP) and is 175,000 BTU which is slightly more BTUs than the older 125FX.  The Bosch 830ES needs a minimum of a 3/4" gas line and has 3/4" water connections also.  The 830ES is a sealed unit and takes its intake air from the outside using 3" PVC.  The unit is vented to the outside using 3" Stainless steel venting and this could be attached to the FX Hood that is already in place using a 3" to 4" increaser (Z-Flex Part #2SVSI0304).  The 830ES is digitally controlled and can go from 100 - 140 degrees F.  See below for more specifications and capacity.

Therm 830 ES	Specifications
Condensing/Non-Condensing	Non-Condensing
Application	Residential or Commercial
Max Input (BTU)	175,000
Min Input (BTU)	19,900
Capacity at 35°F Rise (gpm)	8.3
Capacity at 55°F Rise (gpm)	5.3
Intelligent Cascading	Yes
Min Flow Rate	0.5 gpm
Temp Range (°F)	100 - 140
Temp Stability (°F)	+/- 2
Default Temp (°F)	122
Energy Factor	.82
Thermal Efficiency	82%
Installation Options	Indoor or Outdoor (for outdoor, kit required)
Dimensions (w x h x d)	17 7/8" x 31½" x 11¼"
Weight (lbs.)	67
Inlet Connection	¾" NPT
Outlet Connection	¾" NPT
Gas Connection	¾" NPT
Max Water Pressure	150 psi
Min Water Pressure	30 psi
Min NG Presure	3.5" WC
Condensing Heat Exchanger	n/a
Venting Options	Stainless Steel
Vent Maximun Run	61.25'
Energy Star Rated	Yes

Replacing Older Bosch Tankless with The Bosch Therm 830ES

The Bosch Therm 830ES Non-Condensing tankless water heater is a top performance, gas tankless water heater from Bosch. This 175,000 BTU heater is designed for residential applications and can deliver hot water up to 140 degrees F with a 8.3 GPM flow rate at a 35 degree rise.  Not approved for space heating applications.

This Energy Star approved tankless water heater can produce enough hot water for 2 major applications in most homes.

The Bosch Therm 830ES heater features an electronic ignition system and can vent through either 3 inch or 4 inch diameter stainless steel vent pipe either through the side wall or up through the roof. A stainless steel concentric side-wall venting option (ESHCK-Full-Kit) is also available.

The Bosch 830ES heater comes with built-in Freeze Protection but it does not come with the 3/4" PRV and the External Water Filter.  The freeze prevention kit is designed to provide protection for the water heater down to approximately 5°F for short term conditions only. It will not protect the appliance in areas where the temperature is routinely expected to be below freezing.  The freeze prevention kit will not protect plumbing outside the appliance from freezing.

The Bosch Therm 830ES is a wholesale model heater and sold to licensed plumbers and contractors.  The new Bosch Therm 830ES is a close replacement for older models such as the Bosch 250SX/250SXO, 635ES/635ESO and the 2400E.  Please be aware the 830ES is 7" taller, 2.375" wider and 2.75" deeper than the previous models. The Bosch 830ES is a direct replacement for the Bosch 2400ES.  For outdoor installations the Bosch 830ES would require the BTOK Outdoor Kit.

The Bosch Therm 830ES comes with a limited 15 year warranty on the heat exchanger and 5 years on all other parts.  Service and labor costs are not covered.

Bosch AquaStar 2700ES / 2400ES Heat Exchanger

The Bosch AquaStar 2700ES / 2400ES Heat Exchanger Part 8705406422 is the replacement heat exchanger for all Bosch AquaStar 2700ES and 2400ES tankless water heaters.

This part is also the replacement Heat Exchanger for the Bosch Therm 940ES, 940ESO, 830ES and the Bosch Evolution 500.

TSTAT2 Wireless Remote Control for Bosch Tankless Heaters

The TSTAT2 Wireless Remote Control provides remote temperature control of your Bosch tankless water heater.

It will work with the Bosch AquaStar 2700ES and 2400ES tankless water heaters.

It will also work with the following obsolete Bosch AquaStar models: Bosch 250SX / 250SXO / 2400E / 2400EO.

The TSTAT2 also works with the following Bosch Therm models: 830ES / 940ES / 940ESO / C 1050ES / C 1210ES / C1210ESC.

And it works with the following obsolete Bosch wholesale tankless water heaters: 635ES / 635ESO / 715ES / 800ES / 920ES / 920ESC.

The TSTAT2 Wireless Remote Control is designed to remotely control just the temperature of your Bosch tankless water heater. It does not have a reset button.

Installation is quick and easy. It just requires opening up the control panel, dropping in a small circuit board and connecting the circuit board to the control panel mother board with a short connector wire. The installation manual describes the process of getting your TSTAT2 to sync with your Bosch hot water heater.

Multiple TSTAT2 wireless remotes can be sync'ed with the same Bosch water heater. Temperature control cannot be adjusted while the water heater is in use for safety reasons.

The Bosch wireless remote is great for controlling the output temperature of your tankless water heater if you have a jacuzzi or hot tub. It can also be handy if you want to crank up the water temperature when running certain appliances, such as your dishwasher.

Generally speaking, you want to set your water temperature at the lowest level that will provide you with hot enough water for your shower. The lower the water temperature, the faster the water flows through your Bosch tankless water heater. The faster the water flows through the heater, the less likely that you will experience any on/off cycles if your application flow rate is too near the minimum activation rate of your hot water heater.

Also, why heat up water too hot to use and then have to cool it down seconds later because it is too hot? Lowering the temperature will save you money. Having precise digital remote control of your Bosch tankless water heater's output temperature will allow you to minimize your natural gas or liquid propane consumption - and save you money! Plus , it's fun....

Steve