Tankless water heaters were once the wave of the future, but now they are gaining in popularity every day as homeowners and business owners alike discover the benefits of instant water heating technology. Takagi is a leader in the industry and is known as one of the best tankless water heaters. PlumbingSupply.com® is your source for Takagi tankless gas water heaters -save on your water heating bills, and save the environment!
| Our President believes in tankless water heaters and reducing our "carbon footprint" on the world so much that he installed an outdoor Takagi tankless water heater at his own home. |
Learn how you can qualify for a 2013 federal tax credit by installing a Takagi tankless water heater - learn more
Please note: some areas do not allow installation of a few of these water heaters. Read more
| 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)" |
T-K Jr2
Indoor or Outdoor |
140,000 |
19.500 |
0.75 - 6.6 |
180 gal/hr
(77°F rise) |
NG: 0.82
LP: 0.83 |
NG: 83%
LP: 84% |
33 lbs |
20.5 x 13.8 x 6.7 |
T-K4
Indoor or Outdoor |
190,000 |
11,000 |
0.50 - 8.0 |
246 gal/hr
(77°F rise) |
NG: 0.82
LP: 0.82 |
NG: 82%
LP: 82% |
48 lbs |
20.5 x 13.8 x 8.5 |
T-D2
Indoor or Outdoor |
199,000 |
11,000 |
0.50 - 10.0 |
252 gal/hr
(77°F rise) |
NG: 0.82
LP: 0.82 |
NG: 82%
LP: 82% |
39 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 |
| T-K Jr2 Indoor or Outdoor |
6.6 |
6.6 |
5.7 |
5.1 |
4.6 |
4.2 |
3.8 |
3.5 |
3.3 |
3.1 |
2.9 |
2.7 |
2.4 |
2.3 |
2.2 |
2.1 |
| T-K4 Indoor or Outdoor |
8.0 |
7.8 |
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 |
| T-D2 Indoor or Outdoor |
9.0 |
9.0 |
8.1 |
7.3 |
6.7 |
6.1 |
5.6 |
5.6 |
5.2 |
4.9 |
4.6 |
4.3 |
4.0 |
3.7 |
3.4 |
3.1 |
| 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 |
| Knowing what you need to do when you are deciding whether to buy a tankless water heater or not can help save you money! |
| 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 must be treated 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 |
How Takagi Tankless Water Heaters Work
Takagi Tankless Water Heater Single Unit Recirculation Example
Takagi Tankless Water Heater Multi Unit Recirculation Example
