Call Toll Free Number 1.888.726.9752  | Open 7 Days a Week

Takagi TK-540X3-NIH (Natural Gas)

Product Overview

Takagi TK-540X3-NIH (Natural Gas) Tankless Water Heater with Secondary Condensing Heat Exchanger

199,000 BTUs and up to 140 degrees F, Electronic Ignition, PVC Exhaust, Energy Star, 3/4" NPT Gas Line, For heating potable water only

In stock


Eligible for Free Ground Shipping on orders over $199

Our Price:

Regular Price: $1,699.00

Special Price: $1,495.00


Call Us 24/7 at 888.726.9752 with questions or to place a phone order!


Takagi TK-540X3-NIH (Natural Gas) Whole-House Tankless Water Heater

More Views

  • Takagi TK-540X3-NIH (Natural Gas) Whole-House Tankless Water Heater
Save 10% (up to $300) with the 2011 Federal Tax Credit for qualified Gas Tankless Water Heaters.
  • Takagi TK-540X3-NIH Tankless Water Heater

    The Takagi TK-540X3-NIH Natural Gas Condensing tankless water heater is a top performance, fully condensing Ultra-Low NOx gas tankless water heater with new X3 scale prevention technology from Takagi. This 199,000 BTU heater is designed for commercial or residential applications and can deliver hot water up to 140 degrees F with a 10 GPM flow rate. The built in temperature controller will allow the heater to reach temperatures up to 140 degrees F.

    This Takagi gas tankless water heater is Energy Star rated and can produce enough hot water for 3 major applications in most homes.

    Unlike traditional non-condensing models, condensing technology captures heat from the exhaust gas and uses it to preheat the incoming cold water. This increases efficiency and reduces emissions -- Complies with Ultra-Low NOx regulations of less than 14 ng/J (<20ppm).

    This heater features an electronic ignition system and can vent through either 3 inch or 4 inch diameter PVC/CPVC, stainless steel vent pipe either through the side wall or up through the roof. A PVC concentric venting option is available.

    This heater comes with built-in freeze, overheat and surge protection. The TK-540X3-NIH requires a minimum of a 3/4" gas line. The TK-540X3-NIH can be used with storage tanks and external recirculation systems but is mostly designed and approved for heating potable water only.

    Please note that the Takagi TK-540X3-NIH Tankless Water Heater is the same as the AO Smith ATI-540HX3-N.
  • Brand Takagi
    Model Takagi TK-540X3-NIH
    Manufacturer's Part Number (MPN) TK-540X3-NIH
    Alternate MPNs ATI-540HX3-N
    Condensing Unit Yes
    Voltage (Volts) 120
    Product Dimensions (H" x W" x D") 23.63 x 17.75 x 11.25
    Product Weight (Lbs) 73
    Shipping Weight (Lbs) 73.0000
    Capacity @ 35 Deg F Temp Rise (GPM) 10
    Capacity @ 45 Deg F Temp Rise (GPM) 8
    Capacity @ 55 Deg F Temp Rise (GPM) 7
    Maximum Input (BTUs) 199000
    Minimum Input (BTUs) 15000
    Maximum Output (BTUs) 199000
    Minimum Output (BTUs) 15000
    Altitude Test (Ft) 10,100
    Temperature Range (Deg F) 100 - 140
    Venting Options PVC, CPVC, ABS, Cat III Stainless Steel
    Venting Diameter (Inches) 3 or 4
    Vent Maximum Run (Ft) 100
    Water Connections (Inches) 3/4 NPT
    Water Pressure Rating (PSI) 40 - 150
    Energy Factor 0.93
    Heater Style Tankless
    Activation Flow Rate (GPM) 0.5
    Electrical Requirements (AMPS / V) <=2.5 / 120
    BTU Rating 199000
    Application Commercial,Residential
    Indoor/Outdoor Installation Indoor
    Product Type Whole House
    Remote Control Includes built-in temperature controller
    Color White
    Warranty 15-year limited warranty on the heat exchanger; 5-year limited warranty on all other parts; 1-year labor warranty
  • Write Your Own Review

    You're reviewing: Takagi TK-540X3-NIH (Natural Gas)

  • Warranty

    Takagi gas tankless water heaters are warranted by the Manufacturer (Takagi) through Takagi Corp. will furnish a replacement heat exchanger and will furnish a replacement of any other part which fails in normal use and service within the applicable periods specified below, in accordance with the terms of this warranty. The Takagi Corp. replacement will be warranted for the unexpired portion of the original warranty.

    The Heat Exchanger
    If the heat exchanger fails within Fifteen (15) years after the original installation and operation, Takagi Corp. will furnish a replacement heat exchanger. However, if the water heater is used within an approved hot water recirculation and supplied with circulated water, this heat exchanger warranty is limited to ten (10) years from date of original installation and operation. If the water heater is installed in other than a single family dwelling, commercial use or used for heating applications this heat exchanger warranty is limited to ten (10) years from date of original installation and operation.

    This warranty will not apply:
    1. to defects or malfunctions resulting from failure to properly install, operate or maintain the unit in accordance with the printed instructions provided;
    2. to damage or abuse, accident, neglect or freezing and other acts of nature;
    3. damages due to unauthorized alterations, attachments, and/or repairs.;
    4. damages due to a lack of maintenance (e.g. water filter, vent blockage, etc.);
    5. to defects or damage cause by any attachment or modification, including any energy-saving device;

    All Other Parts
    If any other part fails within five (5) years after original installation and operation, Takagi Corp. will furnish a replacement part free of charge.

    Service Labor Costs
    The manufacturer will provide for reasonable labor charges associated with warranty repairs or replacements within one (1) year from the date of purchase. The manufacturer will only pay directly to the service provider.

    Additionally, all warranty claims and warranty service must be authorized and approved by the manufacturer.

    How to Make a Claim
    Any claim for warranty parts or labor must be made to to the manufacturer.l dealer or distributor:

    500 Wald St.
    Irvine, CA 92618
    Tel. 1-888-882-5244

    The damaged or defective item must be made available in exchange for the replacement.

    No one is authorized to make any other warranties on behalf of Takagi Corp.. It is expressly understood that the replacement warranty of Bosch Thermotechnology Corp. shall be in lieu of any and all other warranties, express or implied, including warranties of merchantability or fitness for a particular use or purpose, and further that Takagi Corp. shall not be liable for any loss or damage directly or indirectly arising from the use of the hot water heater, or for any consequential damages arising from such use (including damages from water leakage). Takagi Corp. sole liability with respect to any defect shall be for the replacement of the defective part(s). Some states do not allow such limitations and exclusions, so the above may not apply to you.

    This warranty gives specific legal rights. You may also have other rights which vary from state to state.
  • Downloads