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Location: 185 Price Parkway, Farmingdale, NY 11735
Hours: 8:00AM - 7:00PM, Mon - Fri.
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This product will NOT be used in the installation or repair of a potable water (human consumption) application.
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Do not use this item for any installation or repair of potable water applications.
This product does not comply with the "Safe Drinking Water Act,"
which requires that products meet low-lead standards in order to be used in systems providing water for human consumption (drinking or cooking).
This item is for non-potable (non-human consumption) water applications only.
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Note: Isolation valves are not included but are recommended for installaltion.
Released in 2010, the T-K4 improves upon many of the features from the T-K3.
The T-K4 is one of Takagi's smaller tankless water heaters. At 13.8 inches wide and weighing only 38 pounds, its ultra-compact design allows it to be mounted on a wall.
Takagi's newest tankless water heater also features an energy factor of 0.82, so it is extremely efficient and environmentally friendly. Since tankless water heaters only burn gas when hot water is needed, installing this unit can help homeowners save up to 45% on their monthly gas bills.
The T-K4-OS has a built-in power venting system and was designed specifically for outdoor installations. The T-K4-OS does not require any additional Category III venting or vent caps, making installation one step easier for installers.
(based on 8 reviews)
of respondents would recommend this to a friend.
Reviewed by 8 customers
Displaying reviews 1-8
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TK-4-OS Takagi Tankless Outdoor Water Heater (NG)
By bill p
from vacaville, ca
Comments about TK-4-OS Takagi Tankless Outdoor Water Heater (NG):
went tankless due to space limitations. previous water heater (gas) worked just fine, but needed the indoor space, so went with this model after doing research online. so far, has worked as described. seems to provide sufficient supply of hot water (one complaint: high temp limited to 122 degrees - would prefer hotter, but safety regs prevent this, i guess). have not yet received gas bill after installation so cannot comment on savings at this time.
Bottom Line Yes, I would recommend this to a friend
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I would recommend this item to everyone!
from San Diego, CA
Ordered this product & received it in approximately 5 days. The most difficulty I had was tapping into & running a 3/4" gas supply from the attic space of a 2 story building down to the outside location on the ground floor. Have been using it for 6 days for the whole single family 2 Bedroom, 1 bath apartment. Provides all the hot water I need, a great product!
Great Outside Tankless..get all parts
By Pursuing Perfection
from Dallas, TX
Very neat compact OUT DOOR unit. No venting to buy or install. Just don't install directly under roof overhang. Be sure to buy the Recess Box that completely houses the tankless unit between 16" on center studs (box is 14.2" wide). However, the depth is 9", that's greater than 2x4 or 2x6 wall if house is sided with OSB and HardiePlank. Most youtube vids show mount on exterior wall.... BAD IDEA, easy to see and steal. Recess box is a must and also use Isolation Valves so you can service/replace tankless if necessary without cutting copper pipes. These two items, in addition to the tankless, really add up to the price "$$" when compared to traditional 30g/50g water tanks.One last thing. The position of the valves in the recess box are NOT optimal due to close proximity of the cold & hot water connection points on TK-4 and the lack of space around the valves forcing you to face the Pressure Relief valve to the right to function. To bad you can't see a picture of how it all installs. One youtube vid "Descaliing a Noritz tankless water heater" shows great valve setup but unfortunately this will NOT work on Takagi installed in Recess Box because no room in box to face pressure relief valve to the left.
Beware of gas inlet bleeder screw
from Clearwater, FL
Comments about TK-4-OS Takagi Tankless Outdoor Water Heater (Propane):
Overall good. Replaced 12 year old TK2 (mother board went bad). Poor design on gas inlet - bleeder screw leaked. Went to remove and reseal and housing immediately broke off. No tool marks from installation - poor design and poor quality metal material with insert for screw. Recommend manufacture change to galvanized or black iron.Not sure why there is a bleeder screw - not on my old TK-2 unit.
Full service heater.
By new guy
from Denver, Co
We purchased this heater to supply our domestic hot water and radiant heating needs. Our house is small so the heating needs are not that great but this unit has performed wonderfully.
Very effective water heater
Comments about TK-4-OS Takagi Tankless Outdoor Water Heater (Natural Gas):
It took just 4-5 hours for our plumber to uninstall the indoor tanked heater and install this one. The electrical part my husband did himself. He said it was not hard. We have chosen this product because of good reviews and it was relatively less expensive than the ones at Home Depot and Loews. Also our plumber said he had this heater installed before, and never had any problems with missing or defective parts. I can say we are completely satisfied with it so far.
from Tacoma Wa.
We chose this little powerhouse to replace our aging early generation tankless heater..Installation was a snap,even if we hadn't been trading tankless for tankless.The built in venting,the included remote temp controller and the very detailed instructions,allow even a novice DIY'er to get this unit up and running in just a couple hours.We used the install to upgrade our fuel and water lines also,allowing PRODIGOUS hot water output,even in our "cooler",Pacific NorthWest location.The units internal heater has only come on once,and worked as described.All in all,a terrific product,at a great price,with very fast shipping. 4 thumbs up from this household..
(1 of 1 customers found this review helpful)
an excellent in-line water heater
from Pasadena, CA
It was great to get rid of our old water heater tank. Takagi unit is small, attractive and it is outside! The only trick is to find a quiet recirculating pump - you will need this to get hot water within seconds versus within minutes. Also, we look forward to the savings!
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