Takagi Tankless Water Heaters T-K3OS. Takagi TK-3-OS On Demand Water Heater. Natural Gas or Propane (LP)

Power Input	Natural Gas — 11,000-190,000 BTU Propane Gas — 11,000-190,000 BTU
Water Pressure	Minimum — 15 PSI Maximum — 150 PSI
Gas Connection	3/4"Male NPT
Water Connection	3/4"Male NPT
Natural Gas Pressure Inlet	Minimum — 5" WC Maximum — 10.5" WC
LP Gas Pressure Inlet	Minimum —8" WC Maximum — 13.5" WC
Thermal Efficiency	Natural Gas — 82.6% Propane Gas — 83.3%
Energy Factor	Natural Gas — 0.81 Propane Gas — 0.82
Electrical Supply	AC 120 Volts (60 Hz), 0.77 Amps
Weight	40 lbs.
Dimensions (H x W x D)	20.5 inches by 13.8 inches by 8.5 inches
Minimum Flow to Activate	.5 GPM
Flow Rates (50 degree Input Water Assumed)	90°F rise / 3.5 gallons per minute 80°F rise / 3.9 gallons per minute 70°F rise / 4.4 gallons per minute 60°F rise / 5.2 gallons per minute 55°F rise / 5.7 gallons per minute 50°F rise / 6.2 gallons per minute 40°F rise / 7.0 gallons per minute
Manifold Pressure	Natural 2.8"WC Propane 3.2"WC
Ignition	Electronic Ignition

Required clearances for TK3-OS Takagi OUTDOOR INSTALLATION On Demand Water Heaters

Takagi T-K3-OS	OUTDOOR INSTALLATION
TOP	36"
FRONT	24" (maintenance space)
BACK	1"
PIPING SIDE (bottom)	12"
SIDES	2"

Freeze Protection System for the Takagi T-K3OS Water Heater

This unit comes equipped with heating blocks to prevent freezing which can damage the heat exchanger
For this freeze prevention system to operate, there has to be electrical power to the unit. Damage to the heat exchanger caused by freezing temperatures due to power loss is not covered under the warranty.
The freeze protection system will activate when the temperature drops below 36.5�F (2.5�C) and is rated to protect the unit down to 5�F (-15�C) in a wind-free environment.
Do NOT install the water heater in an area where the water heater is subject to temperatures (including wind chill) below 5�F (-15�C), as this will void the warranty and Takagi will not be responsible for any damage to the heat exchanger as a result of freezing.
If you will not be using your heater for a long period of time or if the temperatures (including the wind chill) will drop below 5�F (-15�C):
1. Drain the unit of water. Refer to page 18 of the Takagi TK30S install manual.
2. Turn off your heater. This will keep your unit from freezing and being damaged.

CAUTION: Only pipes within the water heater are protected by the freeze protection system. Any water pipes (hot or cold) located outside the unit will not be protected. Properly protect and insulate these pipes from freezing. Thus, for colder climates - it is recommended that you install an indoor water heater rather than an outside install water heater.

Output Temperature Ratings of the Takagi T-K3-OS Water Heater

The Takagi tankless water heater T-K3OS is factory preset at 122°. You can change the output temperature with the internal dipswitches to 113°, 122°, 140° or 167°. If you want to use any other temperatures than this you can purchase the optional Temperature Remote Controller (RE02) that will allow the T-K3-OS to have output temperatures ranging from 99° to 167°.

Please Note: Hot Water Heater Temperatures over 125°F can cause severe burns instantly or death from scalding. Children, disabled and elderly are at the highest risk of being scalded. Feel water temperature before bathing or showering.

For more information download a
Takagi Tankless Water Heater T-K3-OS installation manual in pdf format.
Also see all water heater manuals from this link

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