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Tankless Hot Water Heaters, Efficient, Effective, Endless.
Posts tagged water temperature
Takagi T-K3
Nov 14th
The T-K3 model is one of Takagi’s most versatile and powerful residential tankless water heaters. The T-K3 has Easy-Link capability, allowing owners to connect up to four units without the use of a controller unit. The TK3 can also be converted to a direct vent model to further extend its application in residential homes.
Features
This Takagi TK3 tankless has a number of features that allow it to stand out from the pack.
Compact Size: Only 13.8 inches wide, the T-K3 tankless has the ability to be recessed between wall studs for even more space savings.
Low Activation Flow Rate: The Takagi TK3 activates at only 0.5 GPM, which allows the use of smaller water flows in bathroom sinks and showers. This is a pretty standard flow rate now for new generation tankless water heaters.
Parallel Installation: Easy Link technology allows the T-K3 to be installed with up to three other units without the use of an additional control box.
Direct-Vent Conversion: The TK3 can easily use a direct vent conversion to import combustion air from outside.
Eight Temperature Settings: Some tankless manufactures have only 4 preset temperature settings, the T-K3 offers eight separate temperatures. However, if you want a specific temperature than it is required that you buy the TM-RE10 temperature controller.
Longer vent runs: The T-K3 can have a vent pipe run up to 50 feet with five elbows, instead of the normal 35 with three elbows. This can be a great addition if your particular installation has a long vent run.
Synopsis
The TK3 tankless incorporates a number of important features into one new tankless system, and should fit the needs of most high-volume residential applications. As always performance depends on the temperature of the ground water, and with winter water temperatures here in Ontario, Toronto and the Toronto region dipping to the low 40 degrees F range you can expect the T-K3 tankless to produce a flow rate around 4.1 GPM, or 246 GPH.
Specifications
| Natural Gas Input | Min. 11,000 Btu | Max. 199,000 Btu |
| LPG Input | Min. 11,000 Btu | Max. 199,000 Btu |
| Gas Connection | 3/4″ | |
| Water Connection | 3/4″ | |
| Natural Gas Pressure Inlet | Min 5.0″ W.C. | Max 10.5″ W.C. |
| LP Gas Pressure Inlet | 8″ Min. W.C. | 13.5″ Max. W.C. |
| Weight | 40 lbs | Electronic Ignition |
| Dimensions | 20.5″ X 13.8″ X 8.5″ | |
| Ignition | Electronic Ignition | |
| Electrical Supply | AC 120 V | |
| Water Pressure | Min. 15 psi | Max. 150 psi |
| Manifold Pressure | Natural 2.5 | Propane 4.4 |
Solar Hot Water and a Tankless
Oct 31st
To really reduce your hot water heating charges you could look at adding an active solar water heater in conjunction with a tankless water heater. The rays from the sun would pre-heat the incoming water and then the tankless would simply finish the job. It’s difficult to get a solar water heater to produce water hot enough for today’s household demands, but with the technology in a tankless system it’s a perfect fit. 
Tankless water heaters are smart no, they check incoming water temperature and vary their burners to adapt. So if you have relatively hot water coming in to a tankless it will scale down its natural gas injection to ensure that water out temperature is at your set level. If the burner is scaled down so is your gas bill as only a fraction of fuel is needed.
This is a complicated system and it will be costly, if you are doing this to save money you probably won’t see a breakeven point for a long time. If you’re interested and looking at installing a Frankenstein system you are probable doing it for the environment.
What’s required?
If your installing somewhere in the southern states this will be a lot easier as you don’t have to worry about sub-zero temperatures. Up here in Ontario it’s a definite issue and there are a few systems that can be installed. There is the Active Glycol-based system that circulates food grade glycol and transfers the heat via a heat exchanger to the potable water; this is less efficient but the safest and most popular system in Ontario. The other way is though a drain back system, potable water is forced though the solar collector and drains instantly when the water is shut off. Both these systems work to preheat a tankless systems incoming water supply ultimately reducing the heat and gas needed to raise water temperature to the desired warmth.
These dual systems are not very popular due to the increased expense but a tankless is well suited and designed for a hybrid system. If the idea seems interesting but the price too high you should note that they can be installed in stages, tankless first and then the flat plate solar collector.
Navien Tankless NR180 NR210 NR240
Oct 19th
With Navien Condensing Technology, you’re purchasing the most efficient home water heating system with “Ultra Condensing Efficiency”. Their systems offers substantial savings and produces less emmissions than a conventional water heater. Plus, the installation and venting processes are easy, cost effective, and Navien’s products are high in quality and performance.
The 3 primary Navien models
NR-180
NR-210
NR-240
These three are Natural gas systems, but you should note that they come in propane versions as well. In fact as propane burns hotter than natural gas the propane versions are a bit more efficient.
Navien tankless water heaters utilizes dual stainless steel heat exchangers, providing a longer life-expectancy and more resistance to erosion than copper heat exchangers. All tankless systems are designed to be cleaned and de-scaled, improving life span and durability.
Hot Water Flow Chart.
This chart shows the corrected values for hotwater production of each Navien water heater in relation to ground water temperature. Here in Ontario, Toronto, Mississauga, Hamilton, and the surrounding cities we should assume a ground water temperature of 35F.
Intelligent Remote Control For the Navien Tankless
NR-10DU (Included with every Navien Tankless Water Heater)
. Temperature adjustment in 1¡ÆF increments between 98-120¡ÆF
. Touch activated backlight function
. Easy-to-Use button type control
. Built-in recirculation timer for water and energy savings
. Key-pad lock button prevents inadvertent temperature changes
. Advanced water heater diagnosis capability and error feedback
Endless Hot Water Supply
Navien’s (and all tankless systems) offer an unlimited supply of hot water to meet a home’s unending demand
for hot water. With body showeres becoming much more common place now, it is imperative that you install a tankless. These new shower systems can
run a conventional tank type water heater dry in very short period.
Navien Venting Benefits
The high effciency of Navien’s Condensing Tankless Water Heater results in lower exhaust
temperatures, allowing for the use of 3” PVC venting.
• PVC venting offers a significant cost savings when compared with other venting materials.
• PVC venting is lightweight and easily slides together, reducing installation time
and makes it easy to run long distances.
See the Full Navien Brochure
Rinnai Tankless
Jan 12th
Rinnai Tankless
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If you’re searching for an endless supply of hot water for your home or business, Rinnai tankless water heaters offer you hot water on demand, 
so you are not stuck with a fixed and pre-heated supply. You can enjoy hot water when you want it and for as long as you want it, so go ahead and do the dishes, run the washing machine and take a long and luxurious bath at the same time. No more worrying about running out of hot water with a Rinnai tankless water heater.
As a Rinnai tankless owner you will enjoy up to 40% energy savings. These units are highly efficient and only heat the water when it is needed. When the demand ceases, the unit shuts down and uses zero energy-a revolutionary advantage over the big and bulky inefficient conventional tanks heaters.
Purchasing a Rinnai tankless water heater, gets you will a reliable and durable copper heat exchanger with a typical life span of 20 or more years (that is twice as long as the old tank water heater’s life span). In addition, the traditional tank water heat accumulates a buildup of rust and sediments that collect in the tank-where the water you drink and bathe is stored. With the Rinnai tankless heaters, no water is stored, so you only get fresh and clean hot water because the water is heated as it passes through the unit.
Being about the size of a small suitcase, the Rinnai tankless unit can be installed on virtually any wall on the inside or outside of your home. Rinnai offers you a line of controllers that makes it very easy to set the hot water temperatures for multiple locations in your house.
(update)
Rinnai Condensing Tankless
Rinnai has a condensing unit out in the market now. This tankless has an efficiency of around 95% and utilizes two heat exchangers to attain the high efficiency rating. Rinnai has maintained the single exhaust vent or concentric piping. This unit will get you the full $375 in available grant money from the Ontario Government. If you want to get a free quote for this Rinnai tankless Contact us Here
You can also read more on the Rinnai condensing tankless here.
Paloma Tankless Hot Water Heater
May 12th
Paloma Tankless Water Heater
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Andy talks about the remote control option on the Paloma branded tank, its important to know that these systems are able to support multiple remote control points at various locations in the home. This makes it convenient for adjusting water temperature right at the source, say a shower or bathtub. This is a feature that most manufactures are supplying with their tankless units.
Solar Water Heater and Tankless Update
Apr 21st
Solar Water Heater and Tankless
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One of our readers is working on installing a domestic solar hot water heater in conjunction with a tankless. They were going to go with a Rheem tankless to offset any additinonal temperature increase that was needed over the solar gains. Unfortunately they found out that the particular unit that they were planning on using senses the incoming water temperature, buy ‘ignores’ water that is within 40F of the target temp (ie. the unit won’t cut on to work). This has caused them some problems because:
1) The max output on any residential line is 120F (49C) (this is canadian law it cant be any hotter than this in a residential home).
2) If the solar heated water comes in at 100F (37C) or warmer, the unit will not kick on. This means the output is 37C, a cold shower to be sure.
3) If you go to the commerical unit, the max temp is 180F. This much too hot for residential use (think of someone turning on the hot water at the sink to do dishes), but it would work from the 40F differential standpoint (ie. if the water is 60C or colder, then the unit will fire, anything warmer than 60C doesn’t matter as it would be warm enough for a shower). Again this is illegal in Canada as the Max allowed Temperature is 120F.
The best solution is to more to a Rinnai Tankless water heater as this unit only requires there to be a 20 degree farenheight differentiation between water to be heated and heated water. Therfor your shower will at the very least be 100 degrees farenheight which is plenty warm enough.
These co-heating water heating systems are quite complicated so its important that you talk to a prefessional regarding any plans that you have for your home or cottage. Feel free to send us an email if you have any questions.
The Cold water Sandwich
Mar 23rd
What is the cold water sandwich?
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This sandwich happens when there is warm water for a few minutes then a burst of cold and then rapidly back to warm. This occurs in homes with tankless water heaters as the residual water in the pipes going to a faucet or shower can still be hot. The user in the household will then turn the tap on and feel warm water almost instantly. A tankless water heater takes a few seconds to heat up the heat exchanger and start 
transferring that heat to the water. The result is that a small amount of cold water can make it through the heat exchanger without warming up. When this cold water reaches the end user it may not even be noticed or if the person is in the shower it may be quite evident. After a second or two the heat exchanger is working and hot water is being produced and sent though the hot water pipes bring the desired water temperature again. This does occur more frequently in electric tankless water heaters over gas powered tankless systems. Gas is at full temperature almost immediately where an electric element can take a minute to fully reach its operating temperature.
Now you know what a hot water sandwich is in reference to plumbing and tankless hot water heaters, ask your contractor or installer as there are ways to mitigate this sandwich.
