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Takagi T-K3
Tankless Water Heater
Takagi TK3-OS
Tankless Water Heater

Takagi T-K Jr.
Tankless Water Heater
Takagi T-K3-PRO
Tankless Water Heater
Takagi Mobius TM32
Tankless Water Heaters

Accessories for Takagi tankless water heaters

Takagi Tankless Water Heater Comparison Chart
Model Comparison Details
Max BTU
(NG) Min BTU
(NG) Flow Rate
GPM) 1st Hour
Rating Energy
Factor Thermal
Efficiency Net
Weight Dimensions
(H x W x D)"
FLASH T-K Jr 140,000 19.500 0.75 - 5.8 181 gal/hr
(77°F rise) NG: 0.81
LP: 0.81 NG: 83%
LP: 84% 30 lbs 20 x 14 x 6
FLASH T-K3 199,000 11,000 0.50 - 7.0 257 gal/hr
(77°F rise) NG: 0.82
LP: 0.84 NG: 86%
LP: 87% 40 lbs 20.5 x 13.8 x 8.5
FLASH T-K3-OS 190,000 11,000 0.50 - 7.0 246 gal/hr
(77°F rise) NG: 0.83
LP: 0.83 NG: 82.6%
LP: 83.3% 40 lbs 20.5 x 13.8 x 8.5
FLASH T-K3-SP 190,000 11,000 0.50 - 7.0 240 gal/hr
(77°F rise) NG: 0.81
LP: 0.82 NG: 82.3%
LP: 83.8% 40 lbs 20.5 x 13.8 x 8.5
MOBIUS T-K3-PRO 199,000 11,000 0.50 - 7.0 252 gal/hr
(77°F rise) NG: 0.827
LP: 0.833 NG: 82.3%
LP: 83.6% 40 lbs 20.5 x 13.8 x 8.5
MOBIUS T-M1
Discontinued 235,000 25,000 0.75 - 9.6 300 gal/hr
(77°F rise) NG: 0.81
LP: 0.82 NG: 82.3%
LP: 84.7% 70 lbs 24 x 18 x 9
MOBIUS T-M32 240,000 24,000 0.50 - 9.0 300 gal/hr
(77°F rise) NG: 0.82
LP: 0.84 NG: 82.2%
LP: 83.9% 56 lbs 23.6 x 18.5 x 8.9

Takagi Tankless Water Heater Flow Rate Guide (Temp Rise vs GPM)
Model Temperature Rise (F°)
35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110
FLASH T-K Jr G

P

M 5.8 5.7 5.1 4.6 4.2 3.8 3.5 3.3 3.1 2.9 2.7 2.6 2.4 2.3 2.2 2.1
FLASH T-K3 7.0 7.0 7.0 6.5 5.9 5.4 5.0 4.7 4.3 4.1 3.9 3.6 3.5 3.3 3.1 3.0
FLASH TK3-OS 7.0 7.0 6.9 6.2 5.7 5.4 4.8 4.4 4.1 3.9 3.7 3.5 3.3 3.1 3.0 2.8
FLASH T-K3-SP 7.0 7.0 6.9 6.2 5.7 5.4 4.8 4.4 4.1 3.9 3.7 3.5 3.3 3.1 3.0 2.8
MOBIUS T-K3-PRO 7.0 7.0 6.9 6.2 5.7 5.4 4.8 4.4 4.1 3.9 3.7 3.5 3.3 3.1 3.0 2.8
MOBIUS T-M32 9.0 9.0 8.5 7.7 7.0 6.2 5.9 5.5 5.0 4.8 4.5 4.2 4.0 3.8 3.6 3.5

Takagi Tankless Water Heater Quick Installation Check List
Category Sub-Category Description
Electrical Voltage 120 VAC electrical ground all the way back to electrical service panel
Water Pressure A steady 50 - 60 PSI
Quality Hard water much be treaded with softener or conditioner
Well Water Water pressure must be checked & mineral contents treated
Pipe Material No galvanized supply water pipe
Pressure Relief
Valve Pressure relief only, no T&P
Recirculation
Line Recirculation lines should go through a small electric water heater and not directly back through the Takagi tankless water heater
Gas Gas Type Natural Gas or Liquid Propane - Option to specify is available when ordering
Pipe Size Minimum 3/4" I. D. (inside diameter)
Pressure (NG) 7.0 WC (water column) ideally
Pressure (LP) 10.0 WC (water column) ideally
Air Material Exhaust: 4" stainless steel, cat III
Intake: 3" any material - seal connection
Layout 4" exhaust must be individually run per unit all the way to outside
No common venting
No increase or decrease in diameter
Venting Length 25 - 50ft depending on unit - Deduct 5ft for each elbow used in the venting
Condensation Must have condensation drain when linier run exceeds more than 5ft to protect heat exchanger
Combustion
Air Supply Air supply from outside: 1sq. Inch / 15,000 BTU
Air supply from inside: 1sq. Inch / 1,000 BTU

Takagi Tankless Water Heater Accessory Compatibility Chart

Gas Water Heater Accessories Takagi Tankless Water Heater Models
Description Accessory Part # T-KJr T-K3SP T-K3OS T-K3 T-K3-PRO T-H1 T-M1 T-M32 T-M50
Back Flow
Preventer TK-BF01 (TK-TV03) ✓ ✓ ✓ ✓ ✓ ✓ ✓
TM-BF50 ✓
Wall Vent
Terminator (Louver) TK-KPWL4-1 (TK-TV01)
4.2 - 6" wall thickness ✓ ✓ ✓ ✓ ✓ ✓ ✓
TK-KPWL4-2
5.6 - 9" wall thickness ✓ ✓ ✓ ✓ ✓ ✓ ✓
TK-KPWL4-3
8.2 - 14" wall thickness ✓ ✓ ✓ ✓ ✓ ✓ ✓
Wall Vent
Terminator (Hood) TK-KPWH4-1
4.2 - 6" wall thickness ✓ ✓ ✓ ✓ ✓ ✓ ✓
TK-KPWH4-2
5.6 - 9" wall thickness ✓ ✓ ✓ ✓ ✓ ✓ ✓
TK-KPWH4-3
8.2 - 14" wall thickness ✓ ✓ ✓ ✓ ✓ ✓ ✓
Outdoor Vent
Cap TK-TV04 ✓ ✓ ✓ ✓
TM-TV06 ✓
TK-TV08 ✓
TM-VC32 ✓
TM-VC50 ✓
Direct Vent
Kit TK-TV07 ✓
TK-TV09 ✓
TK-TV10 ✓ ✓
TM-TV11
TM-DV32 ✓
TM-DV50 ✓
Well Vent
Terminator (Direct Vent) TK-TV13 ✓ ✓ ✓ ✓
Recess Box TK-RB01 ✓ ✓ ✓
TK-RB02 ✓
Pipe Cover TK-PC01 ✓ ✓ ✓ ✓
TM-PC32 ✓
TM-PC50 ✓
Multi-Unit Controller
(Includes TM-RE30) TM-MC01
(RE20 + RE30) ✓ ✓ ✓
Remote Control TK-RE02 (TK-RE01) ✓ ✓ ✓
TM-RE30 (TM-RE10) ✓ ✓ ✓ ✓ ✓
Installation Kit
Includes Isolation Valves,
Pressure Relief Valve TK-IV01 ✓ ✓ ✓ ✓ ✓ ✓
TM-IV32 ✓ ✓
TM-IV50 ✓

How Takagi Tankless Water Heaters Work
Process

Takagi Tankless Water Heater Single Unit Recirculation Example
Recirc Systems

Takagi Tankless Water Heater Multi Unit Recirculation Example
Recirc Systems

Takagi tankless water heaters must be installed by a licensed professional.

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Takagi T-K3 Tankless Water Heater	Takagi TK3-OS Tankless Water Heater

Takagi T-K Jr. Tankless Water Heater	Takagi T-K3-PRO Tankless Water Heater	Takagi Mobius TM32 Tankless Water Heaters

Accessories for Takagi tankless water heaters

Takagi Tankless Water Heater Comparison Chart
Model	Comparison Details
Model	Max BTU (NG)	Min BTU (NG)	Flow Rate GPM)	1st Hour Rating	Energy Factor	Thermal Efficiency	Net Weight	Dimensions (H x W x D)"
FLASH T-K Jr	140,000	19.500	0.75 - 5.8	181 gal/hr (77°F rise)	NG: 0.81 LP: 0.81	NG: 83% LP: 84%	30 lbs	20 x 14 x 6
FLASH T-K3	199,000	11,000	0.50 - 7.0	257 gal/hr (77°F rise)	NG: 0.82 LP: 0.84	NG: 86% LP: 87%	40 lbs	20.5 x 13.8 x 8.5
FLASH T-K3-OS	190,000	11,000	0.50 - 7.0	246 gal/hr (77°F rise)	NG: 0.83 LP: 0.83	NG: 82.6% LP: 83.3%	40 lbs	20.5 x 13.8 x 8.5
FLASH T-K3-SP	190,000	11,000	0.50 - 7.0	240 gal/hr (77°F rise)	NG: 0.81 LP: 0.82	NG: 82.3% LP: 83.8%	40 lbs	20.5 x 13.8 x 8.5
MOBIUS T-K3-PRO	199,000	11,000	0.50 - 7.0	252 gal/hr (77°F rise)	NG: 0.827 LP: 0.833	NG: 82.3% LP: 83.6%	40 lbs	20.5 x 13.8 x 8.5
MOBIUS T-M1 Discontinued	235,000	25,000	0.75 - 9.6	300 gal/hr (77°F rise)	NG: 0.81 LP: 0.82	NG: 82.3% LP: 84.7%	70 lbs	24 x 18 x 9
MOBIUS T-M32	240,000	24,000	0.50 - 9.0	300 gal/hr (77°F rise)	NG: 0.82 LP: 0.84	NG: 82.2% LP: 83.9%	56 lbs	23.6 x 18.5 x 8.9

Takagi Tankless Water Heater Flow Rate Guide (Temp Rise vs GPM)
Model		Temperature Rise (F°)
Model		35	40	45	50	55	60	65	70	75	80	85	90	95	100	105	110
FLASH T-K Jr	G P M	5.8	5.7	5.1	4.6	4.2	3.8	3.5	3.3	3.1	2.9	2.7	2.6	2.4	2.3	2.2	2.1
FLASH T-K3		7.0	7.0	7.0	6.5	5.9	5.4	5.0	4.7	4.3	4.1	3.9	3.6	3.5	3.3	3.1	3.0
FLASH TK3-OS		7.0	7.0	6.9	6.2	5.7	5.4	4.8	4.4	4.1	3.9	3.7	3.5	3.3	3.1	3.0	2.8
FLASH T-K3-SP		7.0	7.0	6.9	6.2	5.7	5.4	4.8	4.4	4.1	3.9	3.7	3.5	3.3	3.1	3.0	2.8
MOBIUS T-K3-PRO		7.0	7.0	6.9	6.2	5.7	5.4	4.8	4.4	4.1	3.9	3.7	3.5	3.3	3.1	3.0	2.8
MOBIUS T-M32		9.0	9.0	8.5	7.7	7.0	6.2	5.9	5.5	5.0	4.8	4.5	4.2	4.0	3.8	3.6	3.5

Takagi Tankless Water Heater Quick Installation Check List
Category	Sub-Category	Description
Electrical	Voltage	120 VAC electrical ground all the way back to electrical service panel
Water	Pressure	A steady 50 - 60 PSI
	Quality	Hard water much be treaded with softener or conditioner
	Well Water	Water pressure must be checked & mineral contents treated
	Pipe Material	No galvanized supply water pipe
	Pressure Relief Valve	Pressure relief only, no T&P
	Recirculation Line	Recirculation lines should go through a small electric water heater and not directly back through the Takagi tankless water heater
Gas	Gas Type	Natural Gas or Liquid Propane - Option to specify is available when ordering
	Pipe Size	Minimum 3/4" I. D. (inside diameter)
	Pressure (NG)	7.0 WC (water column) ideally
	Pressure (LP)	10.0 WC (water column) ideally
Air	Material	Exhaust: 4" stainless steel, cat III Intake: 3" any material - seal connection
	Layout	4" exhaust must be individually run per unit all the way to outside No common venting No increase or decrease in diameter
	Venting Length	25 - 50ft depending on unit - Deduct 5ft for each elbow used in the venting
	Condensation	Must have condensation drain when linier run exceeds more than 5ft to protect heat exchanger
	Combustion Air Supply	Air supply from outside: 1sq. Inch / 15,000 BTU Air supply from inside: 1sq. Inch / 1,000 BTU


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