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- Takagi Mobius T-K3-PRO Tankless Water Heaters -

Please don't forget to see items related to these Takagi T-K3-PRO Tankless Water Heaters:
go to accessories for Takagi tankless water heater - go to Rheem tankless water heaters - go to Hot Water Dispensers
go to electric tankless water heaters by Eemax - go to water heater water flex connectors - go to gas-related products
go to stainless steel vent pipe - go to Takagi comparison chart - go to Index page for tankless water heaters


We also offer many more tankless water heaters by Takagi:
to Takagi T-KJr (TKJr) - to Takagi T-K3 (TK3) - to Takagi T-K3-OS - to Takagi T-M32

Takagi T-K3-Pro - Tankless Gas Water Heater For Light Commercial Applications
TK-3 Pro tankless water heater
Takagi T-K3 Pro

(wall brackets are built onto the unit)
This tankless gas water heater features:
  • Flexibility - The T-K3-Pro is ideal for light-commercial applications including small restaurants and beauty salons, in addition to incorporating all the features of the popular T-K3 residential model.
  • Small Water Heater, Large Output! - The T-K3-Pro measures 20.5" x 13.8" x 8.5" allowing for installation in tight spaces or in locations closer to the point of use resulting in less travel-time through pipes and wasting less energy.
  • Money Saving - Without a storage tank, there is nowhere to become clogged with deposits and rust. No pilot light to waste gas. Computer-controlled burners use only the amount of gas required according to the demand, which significantly increases this units efficiency.
  • Wide Range - With the ability to handle water flows ranging from .5 to 7.0 gallons per minute, with heating capability of 11,000 to 199,000 BTU, the T-K3 Pro has the widest range on the market, all controlled by a computer board and sensors checking for flow, temperature and demand.
  • Save Energy - Water is only heated as it is used, without need for a holding tank to waste energy. Computer controlled electronic ignition allows the T-K3-Pro to operate without a pilot light and save up to 50% off utility cost.
  • Peace of Mind - Safety is constantly monitored internally with an advanced system of circuits and sensors checking for over or under-heating, freeze conditions, gas levels, water levels, even air and venting conditions. Utilizing HRS35 copper alloy for the heat exchanger tubing, the T-K3-Pro is also suited for heavier-residential usages such as space-heating and domestic recirculation systems.
  • Protection - The T-K3-Pro comes equipped with heating blocks to prevent freezing which can damage the heat exchanger. The T-K3-Pro also ignites automatically, without a water flow, to prevent freezing of the heat exchanger. Click here for more information
Since water heating is generally at least 20% of an average American family's energy expenses, efficient gas tankless water heaters can potentially cut your family's total annual energy bills significantly. No more wasting energy due to your water being heated 24 hours per day, 365 days per year. Just heat the water that you need, only when you need it!

Takagi T-K3 (TK3) Pro low emissions tankless water heater delivers up to 257 gallons of hot water per hour when raising the water temperature by 77°(from 58° to 135°). No tank means an endless supply of hot water for a house, business or anywhere a constant source of hot water is needed.
We cannot show pricing on the web for these items. To request a price quote, select the items you are interested in by clicking the box in the "Select Item(s)" column next to the product. Click the button below the accessories to add items to your quote list.
Takagi Mobius T-K3-Pro Water Heaters
Model # Description Select Item(s)
T-K3-Pro Natural Gas Tankless Water Heater - Natural Gas, 199,000 max BTU's
T-K3-Pro Pro Propane Tankless Water Heater - Propane, 199,000 max BTU's
 
Accessories for Takagi Mobius T-K3-PRO
Note: Wall brackets are built onto the T-K3-Pro and do not need to be purchased separately
go to gas venting products
Model # Description Select Item(s)
TK-BF01 replaces (TK-TV03) Back Flow Prevention Kit
TK-TV13 Direct Vent Wall Terminator
TK-KPWL4-1 Wall Vent Terminator (Louver) - 4.2" - 6" wall thickness
TK-KPWL4-2 Wall Vent Terminator (Louver) - 5.6" - 9" wall thickness
TK-KPWL4-3 Wall Vent Terminator (Louver) - 8.2" - 14" wall thickness
TK-KPWH4-1 Wall Vent Terminator (Hood) - 4.2" - 6" wall thickness
TK-KPWH4-2 Wall Vent Terminator (Hood) - 5.6" - 9" wall thickness
TK-KPWH4-3 Wall Vent Terminator (Hood) - 8.2" - 14" wall thickness
TK-TV04 Outdoor Vent Cap
TK-TV10 Direct Vent Conversion Kit (optional) - Use this to easily convert the T-K3 Pro into a direct vent model for inside installations that need to import combustion air from outside.
TK-TV13 Wall Vent Terminator (Direct Vent)
TK-RB01 Recess box with vent elbow and vent hood termination
TM-RE30 Temperature Remote Controller (optional)
TK-PC01 Pipe cover
WS1019 Wall Mount Drain Pan for Tankless Water Heaters
The standard temperature setting is 122°F and is only adjustable with purchase of the TK-RE10 temperature remote controller.
 
Pressure Relief Valves
A pressure relief valve is required for all tankless water heaters. In some areas, a temperature and pressure relief valve is required. Check your local plumbing code for more information.
Pressure Relief Valve - Brass - 3/4" - 150 PSI
Temperature and Pressure Relief Valve - up to 200,000 BTU
 
Isolation Valves
Complete inlet/outlet valve system that provides everything you need for a secure installation including full port testing and flushing of the system with easy to install union connections.
Isolation Valve - Set (Hot & Cold) 3/4" IPS Union x 3/4" IPS
Isolation Valve - Set (Hot & Cold) 3/4" IPS Union x 3/4" Sweat
 
Gas Connectors - click here for more gas connectors
Stainless Gasflex - 1" OD (3/4" ID) x 24" - with adapter to 3/4" FIP x 3/4" MIP
Gas Ball Valve 3/4"
 
Water Connectors - click here for more flexible water supply lines
Flexible Corrugated Stainless Steel Water Connector - 3/4" FIP x 3/4" FIP - 18" Long
Flexible Corrugated Stainless Steel Water Connector - 3/4" FIP x 3/4" FIP - 24" Long
Flexible Corrugated Copper / Stainless Steel Water Connector - 3/4" FIP x 3/4" Nom Sweat - 18" Long
Flexible Corrugated Copper / Stainless Steel Water Connector - 3/4" FIP x 3/4" Nom Sweat - 24" Long
 
Hot Water Heater Scale Inhibitor System
Features: inhibits scale build-up, helps protect piping from corrosion, maintains efficiency & extends life of system, 3/4" NPT, 6 GPM, cold water feed line, made from FDA CFR-21 compliant materials, suitable for drinking and cooking water and all food applications, and effective on all types of hot water systems-boilers, tankless, and tank-type (gas or electric). Replacement cartridges (AP431) are available for these in-line scale inhibitor systems.
Hot Water Heater Scale Inhibitor System
Replacement filter for hot water heater scale inhibitor system
Note: Recommended time to change/replace filter cartridge is 6 months. Purchase a replacement cartridge to have on hand when needed.
 
FloodStop Systems for Water Heaters
Automatically shut off the water supply to the water heater and sounds an alarm, leaving all other household fixtures and appliances operational. Powered by AC Adaptor/Transformer or Batteries. Output contacts available, which allow the Controller to connect with Alarm, Home Automation or Auto-Dialer systems if desired. Easily installed in fifteen minutes. 1-Year Manufacturer's Warranty.
FS 3/4-NPT - 3/4" Pipe threaded - full-port motorized ball valve (brass)
- Works with any 3/4" MIPT supply line
FS 3/4-C - 3/4" Compression - full-port motorized ball valve (brass)
- Works with any 3/4" copper applications

Save money and get a quick price quote ... it only takes a minute and is well worth it!!!
Unlike most other products, we cannot show our low pricing on the web for these items.
To request a price quote, simply select the items you are interested in by clicking the box in the "Select Item(s)" column next to the product.
Then click the button below to add the item/s to your quick quote request list.

go to venting products for tankless water heaters


Takagi T-K3 (TK3) Pro - Specifications
Dimensions (H x W x D) 20.5" x 13.8" x 8.5"
Net Weight 40 lbs.
Power input (BTU) NG 11,000 - 199,000
LP 11,000 - 199,000
Thermal Efficiency NG 82.2%
LP 84.9%
First Hour Rating 257 gallons per hour
Gas Connection 3/4" Male NPT
Water Connection 3/4" Male NPT
Water Pressure Min: 15 PSI, Max: 150 PSI
NG Inlet Pressure Min: 5.0" w.c. Max: 10.5" w.c.
LP Inlet Pressure Min: 8" w.c. Max: 13.5" w.c.
Minimum Flow to Activate Burners 3/4 GPM
Vent pipe size 4" round power vent
3" round intake vent
60°F Temp. Rise 5.5 GPM
70°F Temp. Rise 4.7 GPM
80°F Temp. Rise 4.0 GPM
90°F Temp. Rise 3.7 GPM
Electric Supply 120 V 60 Hz
Inlet Water Temperature 60°F
Outlet Water Temperature 130°F

high output tankless water heater chart
Be sure to install only code approved power vent piping.

Venting and Combustion
  • 4" category III stainless steel
  • Vertical or horizontal installation
  • 50' max length, 5 elbows max (90° elbows = 5' equivalent length)
  • Power vent
  • Electronic ignition
  • 3" combustion air intake


Most Frequently Asked Questions

questions about converting natural gas to propane gas "Why can't I install the T-K3-PRO myself?"
answers about converting natural gas.. no Improper installation of the T-K3-PRO could create carbon monoxide gas and other dangerous gases. Installation of this unit by persons other than professionally trained technicians voids the warranty.

questions about HRS35 copper "What is HRS35 copper?"
answers about HRS35 copper HRS35 copper is an alloy that is 99.5% pure copper with a .5% mixture of other elements. These other elements include small amounts of tin (Sn), cobalt (Co), zinc (Zn), nickel (Ni), and phosphorous (P). The mixture of these elements produces a stronger copper alloy that has increased durability and resistance to heat fatigue and out-performs standard copper while still maintaining its advantages.

information about tankless water heaters "If these units don't have a tank, how do they know when to turn on?"
education and frequently asked questions about instant water heaters These tankless water heaters have a flow switch built into them. When you turn on the hot side of a faucet the water begins moving. Once the water is traveling at minimum flow rate for the heater, the flow switch will turn on the gas or electricity.

information about instant water heaters "What's the difference between a conventional flue and a direct vent?"
education and frequently asked questions about conventional flue & direct vent A conventional flue is what most people are familiar with. It typically consists of a double-wall flue pipe going from the top of the heater through the roof, venting outside. The fixture draws its combustion air from the space around it (utility room, garage, hallway, etc.). A direct-vent unit vents and draws its combustion air through a specially designed pipe from the outside via an adjacent wall.

questions about freezing area "I live in an area where it freezes, what can I do to protect the heater from freezing?"
answers about protecting heater from freezing We recommend you use the TK-BF01 exhaust back flow prevention kit to prevent cold air from entering the vent and causing the heat exchanger to freeze.

instant water heaters "Will an instantaneous water heater save me money on my utility bills?"
instant water heaters Yes, in most applications you will see a savings. There are some variables that could reduce the amount you save. One example is you will not run out of hot water, so longer showers could cut into your savings. Also, the cost of electricity, propane and natural gas in your area will affect the amount of money saved. The higher the cost for the energy type used to heat your water, the quicker you will recover the higher initial cost of installing a tankless versus tank style water heater.

Positives:

  • You will never run out of hot water. "You want an hour long shower? No problem!"
  • Electric units can be installed at the point of use.
  • You're not paying energy costs to heat water 24 hours a day.
  • They're easy to install.
  • Our electric units don't require a T&P valve. (No tank!)
  • Installing a tankless water heater will indeed be a bonus to the environment. (Why should we choose wastefulness when we're talking about finite natural resources?)

Negatives:

  • They all need a minimum flow rate & pressure to turn on.
  • The faster water flows through them, the lower the temperature rise. So, if you expect to take a shower while the clothes washer is running, you will need to select a unit sized to your hot water flow requirements. (Gas units handle this a little better than electric models)
  • Electric units need heavy gauge wire. Example: the 9.5kw must have 8ga wire and a 50amp breaker.
  • Gas units need a much larger, special flue pipe and larger gas supply than a conventional water heater.
  • At times they can produce very hot water. It's easier to get scalded.
  • Gas units are more complicated than a conventional water heater.
  • With some brands, parts are hard to find (not a negative if you originally purchase from us, as we like to carry parts for the units that we sell).

Summary:
Tankless water heaters have their place. They're not "the answer" to every hot water need, but if they're used correctly they can be the solution to many of them.

information about Takagi temp. rise "Your products specify the 'temp. rise' based on the GPM flow; what do you mean by this?"
education and frequently asked questions about temperature rise Temperature rise is the amount the heater raises the temperature of the incoming water, based on the flow rate shown of that water.

question about hot water heater scale inhibitor system "What are the best reasons to install a Scale Inhibitor System?"
system extends life The system inhibits scale build-up and protects the piping from corrosion, which helps maintain efficiency and extends the life of the system.

question about hot water heater scale inhibitor system "How does the Hot Water Heater Scale Inhibitor System prevent corrosion?"
system extends life It forms a thin protective layer on the inside of pipes and metal parts. This film or layer is microscopic in thickness and will not build up over time.

question about hot water heater scale inhibitor system "What happens if you don't change cartridges often enough on the Scale Inhibitor System?"
system extends life The original water condition and problem will reappear. Hardness will begin to build up again, which you want to avoid.

question about hot water heater scale inhibitor system "Is the Hot Water Heater Scale Inhibitor System's active ingredient safe?"
system extends life Yes! All ingredients used are 100% pure food grade materials. They are approved by the USDA and meet purity requirements as a food additive by the World Health Organization.

question about hot water heater scale inhibitor system "Will the Hot Water Heater Scale Inhibitor System change the taste or odor of water?"
system extends life No. The active ingredient is colorless, tasteless, and odorless when used as recommended.


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"The power of accurate observation is commonly called cynicism by those who haven't got it." - George Bernard Shaw

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