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Tankless Hot Water Heaters, Efficient, Effective, Endless.
Posts tagged Condensing
Norits Tankless Water Heater
Mar 22nd
Norits Tankless Hot Water
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We are now starting to install the Norits tankless systems to replace the Navien that we have had some troubles with.
The Norits is a condensing tankless that is able to provide sufficient hot water for the typical 3 bedroom 3 bathroom home.
Nortis Advantages
- 0.5 GPM low flow start up requirement
- Direct ignition
- Condensing so
- Greater than 93% efficient
- Digital thermometer for accuracy
- Dual copper primary heat exchangers
- Multi-system compatibility
- PVC (636) venting capabilities
The Noritz 842 tankless water heater also uses a dual flame in its burner. This is a system that recirculates the exhaust gases back into the combustion chamber to burn off any excess fuel and particulate mater so as to increase efficiency and provide, essentially free heat.
Single Burner
Dual Burner
These energy efficient models use dual heat exchangers to increase efficiency to over 93%. Available form Norits are the N-0842MC and the N-0842MC-DV, the tankless come in either direct or power vent.
Fill out this form and see if the Norits tankless will work in your home. CLICK FOR FORM
Noritz is correctly spelled with a Z instead of an S but its a common mistake.
Navien Problems
Mar 18th
Navien Problems
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Navian was the first to come out with a condensing tankless water heater and thus they are bound to have some issues. This post is aimed at addressing some of these problems.
Issues
- Navien flow sensor issues
- Navien Control board failures
- Navien Heat exchanger cracks
The flow sensor
Early Navian models had flow sensors that would easily corrode and shut the unit down as the buildup would impair operation. There is a temporary fix where you take the two clamps off the sensor, pull it out and blow on it. The fix that Navien has made is to change the sensor over to stainless steel, you can replace the part to prevent this unexpected shut down. Also an additional fix is to install a 5 micron filter in the water inlet right before the Navian.
Navian Control Boards or Motherboards
These do fail relatively frequently and symptoms would be that the unit turns on, then off, then on, and then off repeatedly or possibly, fails with error code 03 (ignition failure). There are a few other issues that the board can cause but the only real solution is to power cycle the unit (un-plug and plug back in) or replace the Navien control board.
Cracking Heat Exchanger
This isn’t near as frequent as the problems listed above but it is an issue none the less. A heat exchanger should be replaced immediately; it’s a breach containment allowing exhaust gases to enter your home. The heat exchanger is under Navian warranty.
More Help
Here is some places and information you can use to find additional help.
Our Service Department – 1-855-
Navien Technical Help Line – 1-800-519-8794
Navien online trouble shooting – Go HERE
Navien Warranty details – Find out more HERE (should be accurate for Canada and Ontario)
Additional Issues – Read Here
UPDATE – here is a complete list of Navien error codes – Read HERE
If all else fails post a comment and we can try and trouble-shoot any issues here.
Rennai Tankless water heater
Mar 17th
Rennai Tankless water heater
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Rennai tankless or Rannai tankless is actually spelled Rinnai, it is commonly misspelled as Rennai condensing or Rannai condensing. Here are some more spelling errors for Rinnai tankless water heater.
- Rennai Tankless
- Rinai Tankless
- Renni Tankless
- Rinni Tankless
For the Record it is Rinnai.
Here are some Rinnai Facts
- Uses concentric venting which results in only one hole drilled in your wall but this results in a reduction of venting options.
- Lowest failure rates.
- 10 years parts and labour warranty
- Made in Japan
- 8.0 GPM hot water production on most units
- More than 30 million units installed world wide
- No pilot light (direct electronic ignition)
This picture is an example of the vent pipe that a Rinna tankless uses. Basically there is a pipe inside a pipe, one directs exhaust gases out of the house, while the other allows fresh air to flow in from outside directly to the combustion chamber.
So for the record it is Rinnai.
Takagi T-H2 Manual
Mar 16th
Takagi T-H2 PDF Manual
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This is the Takagi tankless water heater manual for the condensing unit. It is for both the indoor and outdoor units, although I don’t recommend that the outdoor unit be installed
here in Toronto.
FOR : T-H2-DV and T-H2-OS
You must have Adobe reader to view this file. Get it HERE if you dont.
Click on either of the two below to access the manual.
Takagi Condensing Tankless Review
Mar 16th
Takagi Condensing Tankless
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Here is the Takagi T-H2 Condensing Tankless hot water heater, there’s a lot to cover so lets get started.
Takagi Tankless Benefits
- PVC venting
- 95% efficient
- 4.6 GPM in dead of winter
- 8.5 GPM in the summer
- Direct vent capability
Info
The T-H2 model is available as a direct vent or an Outdoor model only. Takagi’s T-H2 “2nd Generation High Efficiency Tankless” unit, is a very energy efficient tankless unit (up to 95% in thermal efficiency) in the Tankless industry. The T-H2 was apparently designed for residential and light commercial use and offers Takagi’s Easy-Link to join multiple units.
The T-H2 can provide upwards of three showers’ worth of water simultaneously in colder climates.
The T-H2 can be vented with PVC, providing 0 clearance for DV installations. PVC venting can be used in all applications and apparently Takagi says that 3″ exhaust venting is now available (previously it required a 3″ intake and a 4″ exhaust).
The primary heat exchanger is made of “Heat Resistant Alloy” HRS35 Copper, Takagi has also added a “High Corrosion Resistant Stainless Steel” #316L secondary heat exchanger to recover waste heat from the vent stack before it leaves the unit to preheat the incoming ground water. This second heat exchanger and the resulting condensation that forms from the high efficiency operation, classify it as a “Condensing” Water Heater.
Download the official Takagi T-H2 Manual Here. Must have a PDF viewer.
Specifications
| Natural Gas Input | Min. 13,000BTU | Max. 199,000BTU |
| LPG Input | Min. 13,000BTU | Max. 199,000BTU |
| Gas Connection | 3/4″ NPT | |
| Water Connection | 3/4″ NPT | |
| Condensate Water Drain | 1/2″ NPT | |
| Natural Gas Pressure Inlet | Min. 5.0″WC | Max 10.5″WC |
| LP Gas Pressure Inlet | Min. 8.0″WC | Max. 14.0″WC |
| Weight | DV = 73lbs. | |
| Dimensions | 25.6″ x 18.5″ x 12.4″ | |
| Ignition | Electronic Ignition | |
| Electrical Supply | AC 120V (60 Hz) | |
| Water Pressure | Min. 15psi | Max. 150psi |
| T-H2DV Manifold Pressure | Natural: 3.15″WC | Propane:4.6″WC |
As we all know Canada can has winter, and this affects our ground water temperature. The higher the tankless has to heat ground water up the lower the output flow of hot water is. Ontario’s ground water fluctuates with the coldest temperatures occurring in February and the warmest is September. Toronto, Hamilton, Brampton, Scarborough, Mississauga for example are places that rarely see ground water temperatures dip below 40 degrees Fahrenheit. Thus its safe to assume a minimum of 4.6GPM in the worst of conditions.
Download the official Takagi T-H2 specifications sheet here. Must have PDF viewer.
Conclusion
If you are looking for a condensing tankless that is relatively cheap and flexible for installation the Takagi condensing unit is definitely one that you should consider. This unit is $2575 our price and the Suggested Retail is $3920, which is considerably more.
Fill out the form below if you are at all interested in this or any other Tankless Water Heater.
Condensing Tankless Explained
Mar 11th
Navian Condensing Tankless
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Navian Condensing Tankless Water Heater
To help explain “condensing technology” for a tankless water heater imagine the condensation that forms on the outside surface of a glass of ice water. This condensation is purposely created inside Navien’s condensing heat exchanger (thats the secondary heat exchanger) from the incoming cold water. This cold water works to cool the hot gases inside the unit increasing its efficiency. Navien’s stainless-steel condensing heat exchanger then traps this condensation and uses it, making the whole process incredibly efficient and economical. This condensation (or vapors and gases) would normally escape through the vents in a conventional tankless water heater. But with Navien’s technology the water heater reuses the condensation, providing one of the most efficient and economical tankless Water Heater a home owner can buy.
Thats how all the Navian condensing Tankless systems work.
Takagi T-H1 – $2575 Tankless
Mar 10th
T-H1 – $2575.00
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The Takagi T-H1 is a condensing tankless water heater, meaning that it is 95% efficient and qualifies for the full 750$ in government rebates (if you have completed the home energy audit).
Significant benefits of this unit are:
