Gas Tankless Water Heaters what size do you need?

This page will give you a quick-view look at all our Tankless Gas Water Heaters.   What size for your needs?  For more detailed information - please review each hot water heater's detailed information pages and on-line manuals.

One major use
(A single Standard use is considered to be 2.5 gallons per minute (GPM) click for more info)

• Takagi T-KJr2-IN - Electronic Ignition - Optional Direct Vent - Horizontal or Vertical Power Vented
• Takagi T-KJr2-OS - Electronic Ignition - Outdoor Installation Only
• Rinnai V65i - Electronic Ignition - Direct Vent - Horizontal or Vertical Power Vented

Takagi T-KJr2-IN tankless water heater will give you about 4.3 GPM with 50-degree water input and a 55-degree temperature rise. This is enough for one standard shower (2.5 gpm) and a small sink at the same time. The Takagi T-KJr can also be used for heating applications up to 167 Degrees F. More info on the Takagi Tankless Water Heater T-KJr2-IN ... Click Here for more info

Takagi T-KJr2-OS tankless water heater will give you about 4.3 GPM with 50-degree water input and a 55-degree temperature rise. The Takagi T-KJr2-OS is basically the same heater as the Takagi T-KJr2-IN but for outside installs only in warmer climates. More info on the Takagi Tankless Water Heater T-KJr2-OS ... click here for more info

Rinnai V65i Gas tankless water heater will give you about 4.6 GPM with 50-degree water input and a 55-degree temperature rise. This is enough for one standard shower (2.5 gpm) and a small sink at the same time. More info on the Rinnai Tankless Water Heater Rinnai V65i ... Click Here for more info

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

• Takagi T-K4-IN - Electronic Ignition - Horizontal or Vertical Power Vented - Optional Direct Vent
• Takagi T-K4-OS - Electronic Ignition - Outdoor Installation
• Rinnai Rl75i - Electronic Ignition - Direct Vent - Horizontal or Vertical Power Vented
• Rinnai RL94i - Electronic Ignition - Direct Vent - Horizontal or Vertical Power Vented

Takagi T-K4 Tankless Hot Water Heater will give you a max output of 8.0 GPM. A 50-degree water input and a 55-degree temperature rise will give you about 5.7 GPM. This is enough for two standard showers (2.5 gpm each). The Takagi T-K4-IN can also be used for heating applications up to 167 Degrees F. More info on the Takagi TK4-IN Tankless Water Heater ... Click Here for more info

Takagi T-K4-OS Outdoor Tankless Hot Water Heater will give you a max output of 8.0 GPM. A 50-degree water input and a 55-degree temperature rise will give you about 5.7 GPM. This is enough for two standard showers (2.5 gpm each). For Outdoor Installation Only in Moderate Temperature Climates More info on the Takagi TK4-OS Tankless Water Heater ... Click Here for more info

Rinnai Rl75i Gas Tankless Hot Water Heater will give you a max output of 7.5 GPM. A 50-degree water input and a 55-degree temperature rise will give you about 5.6 GPM. This is enough for two standard showers (2.5 gpm each). For Indoor Installation Only More info on the Rinnai Rl75 Tankless Water Heater ... Click Here for more info

Rinnai Rl94i Gas Tankless Hot Water Heater will give you a max output of 9.4 GPM. A 50-degree water input and a 55-degree temperature rise will give you about 5.7 GPM. This is enough for two standard showers (2.5 gpm each). For Indoor Installation Only More info on the Rinnai Rl94i Tankless Water Heater ... Click Here for 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
• Any of the Takagi Water heaters with used in conjuction with a storage tank

Takagi T-M32 Tankless Hot Water Heater will give you a max output of 9.6 GPM. A 50-degree water input and a 55-degree temperature rise will give you about 7 GPM. This is enough for two standard showers (2.5 gpm each) and a sink at the same time. In warmer climits with input water at about 60-degrees - you should be able to run 3 single-shower head showers at one time. The Takagi T-M32 can also be used for heating applications up to 180 degrees. More info on the Takagi T-M32 Tankless Water Heater ... Click Here for more info

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 water 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-degrees. Your actual input water may be slightly colder (not likely) or very much warmer (likely in warm climates). You should check and review 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-degrees winter to summer.