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Gas Water Heaters
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  Rinnai RC80HPi
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Electric Water Heaters
  Ariston GL2.5
  Ariston GL4.0
  Ariston GL6+

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  PowerStar AE9.5
  PowerStar AE12
  PowerStar AE115
  PowerStar AE125

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  Tempra 15
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  Tempra Plus 24
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Tankless Water Heater - What size do you need?
This page will give you a quick look at all our gas and electric water heaters.
For more information, please review each heater's detailed information and on-line manuals.


Natural Gas or Propane Tankless Water Heaters
Click here for Electric Tankless Water Heaters

One major use
A single standard use is considered to be 2.5 gallons per minute (GPM)  More info...

  • Bosch AquaStar 1600P - Standing Pilot - Gravity Vent
  • Bosch AquaStar 1600H - Battery Sparked Ignition - Gravity Vent
  • Rinnai V53i - Electronic Ignition - Direct Vent
  • Rinnai T-KJr2 - Electronic Ignition - Direct Vent
Bosch 1600H will give you a max output of 4 GPM. A 50-degree water input and a 55-degree temperature rise will give you 3.3 gpm. This is enough for a standard shower (2.5 gpm) and maybe a small sink at the same time.  More info...

Bosch 1600P will give you a max output of 4 GPM. A 50-degree water input and a 55-degree temperature rise will give you 3.3 gpm. This is enough for a standard shower (2.5 gpm) and maybe a small sink at the same time. With a Standing Pilot. More info...

Rinnai V53i Gas Tankless Water Heater will give you 4.6 pgm with 45-degree water input and a 55-degree temperature rise will give you 3.6 gpm. This is enough for a standard shower (2.5 gpm) and maybe a small sink at the same time. More info...

Takagi T-KJr2 will give you a max output of 6.9 GPM. A 50-degree water input and a 55-degree temperature rise will give you about 4.1 GPM. This is enough for one standard shower (2.5 gpm each) and a sink at the same time. We call the TKJr2 a 1 1/2 use machine. The Takagi T-KJr2 can also be used for heating applications up to 180 degrees.  More info...

Two major uses
A single standard use is considered to be 2.5 gallons per minute (GPM) click for more info

  • Bosch AquaStar 2400ES - Electronic Ignition - Direct Vented
  • Bosch AquaStar 2700ES - Electronic Ignition - Direct Vented
  • Rinnai R75Lsi - Electronic Ignition - Direct Vented
  • Rinnai R94Lsi - Electronic Ignition - Direct Vented
  • Takagi T-K4 - Electronic Ignition - Direct Vented
  • Takagi T-M32 - Electronic Ignition - Direct Vented
Bosch AquaStar 2400ES Model will give you a max output of 6.35 GPM. A 50-degree water input and a 55-degree temperature rise will give you 5.3 gpm. Sealed Combustion - pulls combustion air from outside or inside. This is enough for two standard showers (2.5 gpm each).  More info...

Bosch AquaStar 2700ES Model will give you a max output of 7.15 GPM. A 55-degree temperature rise will give you 5.9 gpm. This is the largest tankless water heater that Bosch produces. Enough for two to three standard uses at one time (2.5 gpm each).  More info...

Rinnai Tankless Heater R75Lsi will give you (with a 50-degree water input and a 55-degree temperature rise) up to about 5.6 GPM. This is enough for two standard showers (2.5 gpm each) and a sink at the same time.  More info...

Rinnai Tankless Heater R94Lsi will give you (with a 50-degree water input and a 55-degree temperature rise) up to about 6.0 GPM. This is enough for two standard showers (2.5 gpm each) and a sink at the same time.  More info...

Takagi T-K4 Model will give you a max output of 6.9 GPM. A 50-degree water input and a 55-degree temperature rise will give you about 5.9 GPM. This is enough for two standard showers (2.5 gpm each) and a sink at the same time. The Takagi T-K4 can also be used for heating applications up to 180 degrees.  More info...

Three major uses or more
A single standard use is considered to be 2.5 gallons per minute (GPM) click for more info

  • Takagi T-M32 - Electronic Ignition - Horizontal or Vertical Power Vented
Takagi Tankless Water Heater T-M32 Model will give you a max output of 9.0 GPM. A 50-degree water input and a 55-degree temperature rise will give you about 6.5 GPM. This is enough for three lower flow showers (2.5 gpm each) at the same time. The Takagi T-M32 can also be used for heating applications up to 180 degrees.  More info...

Specialty Uses
  • Bosch AquaStar 1000P - Standing Pilot
Bosch AquaStar 1000P Model will give you about 1 GPM with a 50-degree water input and 55-degree rise. The 1000P should not be used for showers.  More info...



Electric Tankless Water Heaters

One major use
A single Standard use is considered to be 2.5 gallons per minute (GPM)  More info...

  • PowerStar AE 115
  • PowerStar AE 125
  • Stiebel-Eltron Tempra 20
  • Stiebel-Eltron Tempra 24
  • Stiebel-Eltron Tempra 29
  • Stiebel-Eltron Tempra 36
PowerStar AE115 with a 50-degree water input and a 55-degree temperature rise will give you about 2.4 gpm (80 amps - requires min 150 amp service). This is enough for a standard shower.  More info...

PowerStar AE125 will give you about 3.4 gpm. This is enough for a standard shower (2.5 gpm) and maybe a small sink at the same time. (120 amps - requires min 200 amp service)  More info...

Stiebel-Eltron TEMPRA 20 with a 50-degree water input and a 55-degree temperature rise will give you about 2.4 gpm (80 amps - requires min 150 amp service). This is enough for a standard shower.  More info...

Stiebel-Eltron TEMPRA 24 with a 50-degree water input and a 55-degree temperature rise will give you about 3.1 gpm (100 amps - requires min 180 amp service). This is enough for a standard shower.  More info...

Stiebel-Eltron TEMPRA 29 will give you about 3.4 gpm. This is enough for a standard shower (2.5 gpm) and maybe a small sink at the same time. (120 amps - requires min 200 amp service)  More info...

Stiebel-Eltron TEMPRA 36 will give you about 4.5 gpm. This is enough for a standard shower (2.5 gpm) and a small sink at the same time. For locations with ground water over 60-degrees - the Tempra 36 should give you enough hot water for 2 showers with 240 volts. (150 amps - requires min 300 amp service)  More info...

Specialty Uses
  • PowerStar AE9.5, AE3.4, AE7.2, AE12
  • Ariston GL2.5, GL4 GL6+
PowerStar Point-of-Use - check specifications for these heaters. None of these units should be used for showers.  More info...

Ariston - check specifications for these heaters. These are mini-tanks for 1 - 2 or 3 sinks.  More info...


What is a typical use? **
Appliance Flow Rate GPM
Bathroom Faucet 1.0
Bath Tub 4.0 to 5.0
Shower 2.5
Multi Shower Heads 2.5 to 12
Kitchen Sink 1.5
Dishwasher 1.5
Washing Machine 2.0


Please note: These numbers may not reflect your appliances or fixtures due to differences in water pressure from location to location. Differences are also due to efficiency of appliances and fixtures.

If you have a multi shower head system - you need to find out how much water all the shower heads will consume per minute. Make sure the tankless heater you use will provide the correct amount of hot water. If you don't see one - contact us and we will advise you how to use a tankless water heater with a multi-shower head system.


One last thing: We are assuming that your input water (ground) is 50°F. Your actual input water may be slightly colder (not likely) or very much warmer (likely in warm climates). You should check your input water temperature before relying on any of the above numbers. If your ground water is colder then you will get less output - if your ground water is warmer then you will get more output.
Average ground water in the USA is between 50 and 55°F winter to summer.
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