Accessories for Takagi Tankless Water Heaters

Adding a tankless water heater to your home or business is a great way to reduce the high cost of water heating, and benefits the environment as well. Accessories for the Takagi tankless water heaters will round out the installation making it function as smoothly as possible. When you need tankless water heater products, think®!

Item Model # Description Price & Quantity
Drawing of Takagi EKK1X Heat Exchanger Assembly EKK1X Replacement Heat Exchanger Assembly for T-K3 $410.55 Enter a quantity and
wall vent terminator #9008004005 Wall Vent Terminator (Hood) - 4.0" - 7" wall thickness $124.66 Enter a quantity and
Image of pipe cover TK-PC01 Pipe cover for the T-K3, T-K3-OS, T-D2-IN, T-D2-OS $114.93 Enter a quantity and

Find more Takagi gas venting components on our page

Takagi Controller Systems

Image Description Price & Quantity
Takagi TK-RE02 TK-RE02
  • Temperature remote controller for T-K1S, T-K2, T-KJr, T-K3-OS and T-KD20 water heaters. It allows output temperatures beyond the factory settings, shows error codes, and monitors incoming and outgoing water temperatures
$111.72 Enter a quantity and
Takagi TK-RE30 TM-RE30
  • (replaces TM-RE10)
    Remote temperature controller for T-K3, T-K3-SP, T-M1, T-M199, T-H1 and T-M50 water heaters. It allows output temperatures beyond the factory settings and also shows error codes for problems that might develop
$133.76 Enter a quantity and
Takagi TM-MC01 TM-MC01 (replaces TM-RE20 and includes TM-RE30)
  • Mobius Multi system controller is capable of handling up to 20 units at one time. It also works as a diagnostic tool that provides error codes
$760.10 Enter a quantity and

Tankless Water Heater Drain Pan

Image Description Price & Quantity
Wall Saver for Tankless Water Heaters Drain Pan with PVC Adapter
  • Designed to help protect areas around the mounted heater from water damage.
6-pack of Drain Pans - includes PVC drain adapter $297.49 Enter a quantity and
PVC drain connector Replacement PVC Drain Connector
Includes 1 each: 1" PVC male adapter, gasket, and locknut
$2.79 Enter a quantity and

Order 6, 12, 24 or more drain pans for additional savings!
Order 2, 4 or more 6-Packs for additional savings!

Pricing discounts will show up in your shopping cart.

Brass Pressure Relief Valves

Image Description Size Price & Quantity
Pressure relief valve Brass Pressure Relief Valve
  • 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
3/4" FIPS x 3/4" MIPS $18.29 Enter a quantity and

Brass Temperature & Pressure Relief Valves

Image Description Size Material Price & Quantity
Pressure and temperature relief valve Brass Temperature and Pressure Relief Valve 3/4" FIPS x 3/4" MIPS FOR Potable Water $94.05 Enter a quantity and
3/4" FIPS x 3/4" MIPS NOT FOR Potable Water $7.47 Enter a quantity and

"The Isolator" Water Heater 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.
  • Easy two step installation of your tankless water heater with unsurpassed safety, features and benefits.
  • The ability to drain your hot water lines throughout the building or just at the water heater with a quick quarter turn.
  • Extra features like a full port for full flow throughout the valve including a full port outlet for purging, flushing and testing the system.
  • Pressure relief valve included - rated for 150 psi and 200,000 BTU's
  • Protection for the life of your system
  • Emergencies are handled with quick quarter turn ball valve shut-offs for total isolation of your system in seconds.
  • Repair or replace your heater in minutes with easy-fit union style connections that do not disturb your piping system.
  • "CleanBrass" construction complies with the Federal Safe Drinking Water Act

Description Size Price & Quantity
Isolation Valve Set (1 Pair)  (Hot & Cold)
- includes pressure relief valve
3/4" FIPS Union x 3/4" FIPS $121.23 Enter a quantity and
Isolation Valve Set (1 Pair)  (Hot & Cold)
- includes pressure relief valve
3/4" FIPS Union x 3/4" Sweat $122.18 Enter a quantity and

Ultraflow™ High BTU Stainless Steel Gas Connectors

Ultraflow plastic coated gas connectors
  • Pre-assembled
  • Designed for applications with a significant BTU requirement
  • Can supply up to 290,000 BTU (NG) or 465,000 (LP)
  • Increases productivity by eliminating the need for pipe nipples, 90's and elbows
  • Common applications: tankless water heaters, commercial water heaters, furnaces, manufactured homes, boilers, rooftop HVAC units, and gas meters

Description Size Price & Quantity
Stainless Gasflex 1"od (3/4"id) x 24"
with adapter to 3/4"fip x 3/4"mip
$46.54 Enter a quantity and
Gas ball valve 3/4" x 3/4" $10.18 Enter a quantity and

to flexible gas connectors - to stainless flex connectors for water

Water Heater Scale Inhibitor System

image of complete scale inhibitor system
This scale inhibitor system features:
  • Highly effective in treating scale, corrosion and iron build-up for up to 6 months
  • Food-grade hexametaphosphate crystals dissolve slowly in water to prevent lime, scale and rust build-up
  • Forms a protective coating on all metal surfaces, safeguarding against acidity/alkalinity, hardness, chloride and other factors which effect the corrosion of water equipment and pipes
  • Maintains efficiently and extends life of system
  • Up to 5gpm
  • Recommended for use with water heaters, ice machines, vending machines, food service equipment, air conditioning and many other types of water processing applications
  • If using on a water heater, it needs to be installed on cold water line entering the water heater
  • Dimensions: 2 7/8" x 9 5/8"
  • Recommended time to change/replace this inhibitor cartridge is 4-6 months
  • It's a good idea to purchase a replacement cartridge to have on hand when needed!
  • For more information, go to our Scale Inhibitor Page

Description Price & Quantity
Scale Inhibitor System:
includes housing, cartridge and mounting bracket
$116.17 Enter a quantity and
Replacement Inhibitor Cartridge
Save on shipping by ordering replacement cartridge now!
$36.47 Enter a quantity and
Mounting Bracket:
included with Scale Inhibitor System
$10.48 Enter a quantity and

Related Items & Accessories

Common Terms and Definitions
  • C, SWT, S or Socket: A regular hub or socket. The pipe fits (sweats/solders) inside this
  • S x S: Regular hub or socket on both ends
  • Mips: Male pipe threads on the outside of fitting
  • Fips: Female pipe threads on the inside of fitting
  • FTG: The same size as the pipe. Will fit inside a socket (hub) fitting
  • Hyset: Has a nailing flange on the front of the fitting
  • Dropear: Has a nailing flange on the back of the fitting
  • Nominal: Used to describe copper pipe and fittings in plumbing. Refers to the inside diameter of the pipe which varies by thickness of the pipe. The outside is a constant size and is always 1/8" larger than the nominal size. Example: 1/2" nominal is always 5/8" O.D.

Frequently Asked Questions

Q. "What type of vent do these tankless water heaters require?"
A. These tankless water heaters require Category III stainless steel vent only.

Q. "Is it possible to drain a tankless water heater to prevent freeze damage when not in use?"
A. Yes. Simply drain both lines 'to' and 'from' the unit. As long as there are no check valves in the way, that should drain the water from the unit. To guarantee that there is no water in the unit, we recommend two drain valves - one before and one after the unit - as well as blowing air through the water line.

Q. "I would like to convert my natural gas tankless heater to be able to use LPG (propane) gas instead. Do you offer a conversion kit?"
A. Sorry, but we don't. Even if we could, we probably wouldn't, as in most cases it is not a good idea to convert one type of gas for another. Burners can be different, orifices, etc. Not only is the BTU rating different for these two gases, but also the heat of the flames and a number of other factors. We simply do not wish to sell ("profit from") something that might create a non-safe environment.

Q. "I live in an area where it freezes, what can I do to protect the heater from freezing?"
A. We recommend you use the TK-TV03 exhaust backflow prevention kit to prevent cold air from entering the vent and causing the heat exchanger to freeze.

Q. "If these units don't have a tank, how do they know when to turn on?"
A. 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.

Q. "What's the difference between a conventional flue and a direct vent?"
A. 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 on the other hand, both vents and draws its combustion air through a specially designed pipe from the outside via an adjacent wall.

Q. "Your products specify the 'temp. rise' based on the GPM flow; what do you mean by this?"
A. Temperature rise is the amount the heater raises the temperature of the incoming water, based on the flow rate shown of that water.

Q. "Will a tankless water heater save me money on my utility bills?"
A. Yes, however, the amount of savings will depend on the type of fuel used to heat the water. Usually electricity is more expensive than propane, and propane is usually more expensive than natural gas. In most cases you and the environmemnt will benefit from a tankless water heater.

Q. "Can I use PVC to vent gas tankless water heaters?"
A. No. The temperature of the exhaust is too high to safely use PVC as venting material. We never recommend PVC as venting even where the ideal exhaust temperatures would technically allow it due to a much higher incident of dangerous issues associated with PVC venting on poorly-maintained gas tankless water heaters.

Q. "I'm hearing a lot about lead-free these days. What does that have to do with plumbing products and how does the new lead-free legislation affect me?"
A. Basically, the laws implemented Jan. 1st, 2014 require plumbing products that come in contact with drinking water to be "essentially lead free" (less than 0.25% weighted average). For further information about how the law determines what is "lead free", rules regarding which plumbing products must be "lead free", and who these laws will affect, please view our page.

All Takagi Tankless Water Heaters must be installed by a licensed professional.

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