Frequently Asked Questions

  • How big are tankless water heaters?

    Most are about the size of an average suitcase. The Takagi line ranges from less than two feet high by 14 inches wide, weighing 30 pounds; to 28 inches high by 19 inches wide weighing 90 pounds. Most models are small enough to hang on a wall.

  • Will tankless water heaters work with hard water?

    Although many heaters are currently working well without any water treatment, we recommend that homeowners in areas with hard water install a water softener or a Water treatment device like the Product Preservers® Anti-Scale System in the water line before the heater. This should lengthen its lifespan as well as the time between servicing. In areas with exceptionally hard-water conditions, the heat exchanger inside the unit may require periodic flushing by a plumber to remove built-up scale. Keeping the temperature low also helps to prevent scale buildup in severe, hard-water conditions.
  • What size heater will I need for my single-family home? For my apartment building?

    For Basic Sizing Guidelines, Go Here. For more specific sizing, we recommend contacting a local contractor or contacting our customer support.

  • Can homeowners do the installation themselves?

    This product must be installed and serviced by a licensed plumber, a licensed gas fitter, or professional service technician. Improper installation and/or operation, or installation by an unqualified person, will void the warranty.

  • Where can I have my tankless water heater installed?

    It can be installed anywhere with access to adequate combustion air and where the heater exhaust can be vented to the outdoors, it should not be installed outdoors if the home or business is located in a freezing climate. In a replacement situation, a tankless heater can usually go where the heater currently is located, although you may want to relocate the new unit to create more room or to achieve better venting options. Wherever you choose to locate the new tankless unit, always check for proper gas-line size. That's usually because the more powerful tankless models usually require larger gas lines than tanks.

  • Are there special venting requirements?

    You must use a dedicated, Category III approved vent pipe for the entire exhaust run. For condensing models, you can use both PVC schedule 40 or ABS and Category III material for entire exhaust run. You may not common-vent with any other appliance. Refer to the heater's Installation Manual for specific venting requirements.

  • Tankless is often referred to as 'Instantaneous Water Heaters.'  Can I expect to have instant hot water at all my faucets and showers?

    No. It still takes time to get the water to your faucets, just like it always has. Our heaters provide constant flow of hot water at the desired temperature. To get "instant" hot water, you need a recirculation system.

  • Can I use a recirculation pump? How big should it be?

    Yes, you can use a recirculation pump. The pump should be sized to provide enough flow to the heater depending on the model/application. However, it should not be oversized so that it wastes energy and causes erosion of the system piping. We recommend aiming for 2 to 4 GPM of recirculation flow. Please refer to the Specification Sheets for more detail or contact Customer Service.

  • What is the warranty on a Takagi tankless water heater?

    The Residential warranty is 15 years on the heat exchanger and five years on all of the other parts, except for fuses. Commercial warranties are 10 years on the heat exchanger and 5 years on all of the other parts.

  • What kind of customer service support can I expect from Takagi?

    We are committed to provide exceptional customer service to satisfy your needs. Our website provides basic Troubleshooting & Repair and contact information for submitting your questions. Takagi has live call centers with experienced technicians from 5 am to 5 pm Pacific (8 am to 8 pm Eastern) throughout the country. In many areas there are factory trained service providers. For the listing of service providers in your area, please follow FIND A SERVICE TECHNICIAN

  • How can I register my water heater?

    You can Register your Takagi Water Heater by filling out the Warranty Registration Card that came with your heater, or you can Register Online

  • What information should I have when I register my water heater or call in to customer service?

    Heater model number & serial number and the date of heater installation.
    Takagi Water Heater Model Number & Serial NUmber Ratings Plate