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Gas Tankless Water Heaters
Bosch AquaStar 2400E
Bosch AquaStar 2500EO
Bosch AquaStar 1600H
Bosch AquaStar 125FX
Bosch AquaStar 1600P
Bosch AquaStar 125BO
Bosch AquaStar 1600PS
Bosch AquaStar 1000P


Takagi T-KJr
Takagi T-K3
Takagi T-M1


Electric Tankless Water Heaters
Stiebel Eltron
PowerStar
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Electric Mini-Tank Water Heater
Ariston
Stiebel Eltron SHC4


Oil Tankless Water Heaters
Toyotomi


RV and Boat Water Heaters
RV 500
Boat ShowerMate


Accessories
4" Z Flex Venting
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AQ1 Power-vent
FXHood
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AquaStar Specs and Design Features
AquaStar by Bosch Tankless Water Heaters are fueled by either Propane or Natural Gas.
This page will give you all the Specs and design info for all the water heaters made by AquaStar



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AquaStar Design Features
Internal view of the AquaStar Propane and Gas Tankless Water Heater The features list is long –

Bosch AquaStar Tankless Water Heaters are designed to last a lifetime. The quality of the AquaStar begins with this inside story: all water parts are solid copper or solid brass. The unit is constructed with stainless steel and aluminum. Unlike tank heaters, every part is replaceable or recyclable. Properly maintained, this may be the last water heater you ever buy.

  • all water parts are solid copper or solid brass
  • unit is constructed with stainless steel and aluminum
  • casing is finished with baked epoxy
  • heat exchanger is made of solid copper
  • burners are made of stainless steel
  • unit has a safety thermocouple and overheat shutoff protection
  • AGA and CGA design certified
  • 82% efficiency rating and .80 energy factor — highest in industry
  • longest warranty (10 years on the heat exchanger)
  • Available in both propane (LP) and natural gas



Manufactured by Robert Bosch.
Few names in manufacturing are as well known as Robert Bosch. You may already use some of their well designed power tools. And Bosch has been making tankless water heaters for over 60 years. More than 4,000 units are produced every day at Bosch's Vulcano factory. It is a state of the art facility with rigorous standards for quality control, including ISO 9002.


Model 38B 125HX / 16000H 125FX 125B / 125BO 250SX 125BS
Energy Factor .66 .80 .78 .69 .85 .69
Efficiency 80% 82% 80% 82% 87% 82%
BTU/input 40,000 117,000 125,000 117,000 175,000 117,000
Minimum Flow Rate GPM 0.6 0.5 0.5 0.5 0.8 0.5
@ 45° rise 1.3 GPM 4.0 GPM 4.0 GPM 4.0 GPM 6.4 GPM 4.0 GPM
@ 55° rise 1.0 GPM 3.3 GPM 3.3 GPM 3.3 GPM 5.3 GPM 3.3 GPM
@ 65° rise 0.9 GPM 2.8 GPM 2.8 GPM 2.8 GPM 4.5 GPM 2.8 GPM
@ 75° rise 0.8 GPM 2.4 GPM 2.4 GPM 2.4 GPM 3.9 GPM 2.4 GPM
@ 90° rise 0.6 GPM 2.0 GPM 2.0 GPM 2.0 GPM 3.3 GPM 2.0 GPM
Flue Size 4" 5" 4" 5" 3" 5"
Water Inlet 1/2" NPT 1/2" NPT 1/2" NPT 1/2" NPT 3/4" NPT 1/2" NPT
Gas Inlet Connection 1/2" NPT 1/2" NPT 1/2" NPT 1/2" NPT 3/4" NPT 1/2" NPT
Min. Natural Gas Line 1/2" NPT 3/4" NPT 3/4" NPT 3/4" NPT 3/4" NPT 3/4" NPT
Min. LP Gas Line 3/8" 5/8" 5/8" 5/8" 3/4" 5/8"
Height 25 3/8" 29 3/4" 29 3/4" 29 3/4" 23 1/2" 29 3/4"
Width 10 5/8" 18 1/4" 18 1/4" 18 1/4" 15 3/4" 18 1/4"
Depth 9 1/8" 8 3/4" 8 3/4" 8 3/4" 8 1/2" 8 3/4"
Shipping Weight 25 lbs 44 lbs 51 lbs 44 lbs 47 lbs 44 lbs
Recom. Min. Water Pressure 30 PSI 30 PSI 30 PSI 30 PSI 30 PSI 30 PSI
Max. Water Pressure 150 PSI 150 PSI 150 PSI 150 PSI 150 PSI 150 PSI
Min. LP Gas Pressure 11" W.C. 11" W.C. 11" W.C. 11" W.C. 11" W.C. 11" W.C.
Min. Natural Gas Pressure 7" W.C. 7" W.C. 7" W.C. 7" W.C. 5" W.C. 7" W.C.


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