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Tankless Hot Water Heaters, Efficient, Effective, Endless.
Posts tagged exhaust
Navien NR-240
Jan 6th
Navien NR-240 Tankless Water Heater Information
| Navien NR-240 |
| Input : 20,000~199,000 BTU/h |
| Thermal Efficiency : 98% |
| Energy Factor : 0.95 |
| Flow Rate |
| ㆍAt 35˚F Rise : 11 GPM |
| ㆍAt 45˚F Rise : 8.6 GPM |
| ㆍAt 77˚F Rise : 5.5 GPM |
Navien Offers Ultimate in Energy Efficiency with Hi-Tech Comfort
- Easy installation and PVC venting for Navien tankless
- 3″ SCH 40 solid PVC up to 100′
- Navien holds the industry’s highest energy efficiency rating – 98%
- Ready Link Cascade System
- Optional built-in recirculation system with buffer tank
- Advanced Eco Navien technology
- Extended lifecycle utilizing dual stainless steel heat exchangers
- Advanced remote control – NR-10DU
- Navien has the industry’s best warranty
Heat Exchanger
Navien tankless water heaters utilizes dual stainless steel heat exchangers, providing 3.8 to 4.5 times longer life-expectancy and erosion resistance over the copper heat exchangers used in other tankless brands. Navien’s heat exchangers operate with relatively low water temperature, minimizing damage from hard water conditions and maintains efficiency levels. Its always important to have your tankless flushed once every 2 years or so to remove any buildup from within the heat exchangers.
Efficiency
Because of Naviens high efficiency the tankless can be vented in PVC piping. Basically excess heat is exhausted with all the combustion gasses in conventional tank systems but a Navien uses this to further heat the water. This results in significantly lower exhaust temperatures and allows for the use of PVC exhaust vent piping.
Links and Further Info
- Official Navien Site – http://www.navienamerica.com/
- Navien Promotional PDF
- Navien Tankless Operation Manual
- Price Range – from $2400 to $4500 per unit, installation included.
Tankless Systems in Toronto Winter
Jan 13th
Problems can arise with a tankless water heater in a Toronto winter as the high efficient models (condensing tankless systems) emit a lot of moisture in their exhaust. When the temperature is extremely cold this moisture can freeze and start to plug up the exhaust vent causing your tankless to shut down. Its important to periodically take a quick look at the exhaust vent of your tankless (and furnace/dryer for that matter) just to make sure there isn’t any buildup.
Tankless Issue
- Ice buildup in exhaust vent
- Buildup blocks flow and potentially causes a dangerous carbon monoxide flow into your home
- Tankless should shut down and produce an error code when the exhaust is blocked
Resolution
- If the tankless was just running the warm exhaust gasses should have melted the buildup enough for you to pull it free.
- A blow dryer can work wonders at melting the buildup, but be cautious as the dripping water and electricity can be very dangerous
- Call a service technician if all else fails
This condition is rare and can occur with your dryer or furnace so its important that you as a home owner in Toronto experiencing winter are aware of it.
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 – 1-855-696-8265
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.
Navien Venting
Oct 22nd
Navian Venting
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Navian Tankless water heaters have a significant advantage in their venting requirements. For the Navian system to meet code it only need to be vented with conventional PVC piping. This results in a significant cost savings for the consumer or Navian tankless owner. The required pipe can be purchased at your local Home Depot or hardware store. In addition if you purchase the system from a certified installer or dealer they are able to pass the savings on to you, reducing the overall cost.
The reason that conventional piping can be used is due to the Navian system recycling so much of the heat that the exhaust gasses being released are basically just warm air. This reduces the risk of fire and allows for more versitile venting options.
If your considering a tankless water heater, take another look at the Navian systems they are full of unique innovations other companies are trying to match.
Are you in the greater toronto area or the golden horse shoe? Places like Mississauga, Hamilton, Oakville, Newmarket, Vaughn, Richmond Hill, Scarborough. If so we are a certified dealer and installer of Navien Tankless water heaters fill out a quick form and we can have someone call you within 24 hours to book a free consultation and see if your home fits the requirements for a tankless water heater.
Fill out the form here for a Free Quote FORM
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Rinnai Concentric Venting
Apr 28th
Rinnai Venting
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Rinnai tankless water heaters use a single tube for their venting, how do they do this? It’s quite a simple process that prevents two holes from being drilled in your wall. As you can see in the picture of the elbow, the vent pipe has two distinct sections. This type of venting piping is called concentric venting. 
The tankless concentric vent pipe handles both the incoming supply air as well as ejecting the toxic exhaust gases. This form of tankless venting can save an extra hole in your wall and thus reduced risk of air leakage.
Concentric venting is really quite expensive as the pipe is made from stainless steel. On average you are looking at about 60 dollars per foot plus installation. This is why it important to position a Rinnai tankless water heater as close as possible to its venting termination point.
Navien Condensing Tankless 98%
Apr 22nd
Navien Condensing Tankless 98%
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Navian tankless water heaters are rated at up to 98% efficiency; this is achieved through a process called 
condensing. This is the highest rated condensing tankless available on the market today. As a result if the Navian’s high efficiency an average house can expect to save about 40$ additional over a conventional non condensing tankless Water heater. Compare it to a conventional tank type water heater and you could potentially save more than 160$. Efficiency is the key for the future, we need to get more out of what we now have less of. 98% of the energy used in this Navian unit actually works to heat water and is not just blown out the exhaust vent. The chart should help to determine what size of Navien tankless water heater you might need to meet your home/familys domestic hot water needs.
Navian has now moved to dual stainless steel heat exchanges in its tankless water heaters, they claim that this material offers 20 times more corrosion resistance and increased condensation damage. The Navien Tankless water heaters are also employing a new air pressure sensor that senses incoming and oxygen and can compensate for long vent runs to maximize efficiency in the combustion chamber.
Navien has also updated their website so check it out here. Visit Navien’s Website
Get a Free Consultation on a Navien for Your Home – Call Toll Free 1-855-696-8265
Condensing verses Non-Condensing Tankless
Mar 27th
Condensing verses Non-Condensing
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Tankless water heaters come in two different efficiency styles, condensing and non condensing. A condensing unit will recover more than 85% of the gas that a regular tankless water heater would otherwise vent out. Navien or “Navian” makes a tankless system that is 98% efficient by employing the condensing system. The high efficiency is gained by allowing the relatively warm exhaust gases to transfer otherwise wasted heat to the incoming water preheating it before flowing through the primary heat exchanger. This adds about a 10 to 15 percent efficiency increase to a tankless water heater which in itself is already quite efficient.
Now the grants that are available from the provincial and federal government are 
different for a condensing and non condensing tankless water heater. A condensing unit will receive $600 in total grants or $300 from each government level. The non condensing unit will net you $250 from provincial and federal netting $500 total. The governments trying to reduce energy consumption and pollution emissions would naturally give more grant money to tankless water heaters that are the most efficient.
Rinnai Installation Diagram
Feb 11th
Rinnai Installation Diagram |
If you decide that a tankless water heater is a good idea for your home you should consider the requirements that your house will need to meet first. Tankless systems have a number of additional needs over your conventional tank water heater. We install more Rinnai than any other system so I will give the specifications for this system, although they are all quite similar.
A 3 FT clearance is required for the following:
- a. Windows
- b. Any exhaust outlets – Furnace, dryer vent, kitchen vent etc.
- c. Gas Meter – The vent needs to be at least 3 feet from the gas meter and the pressure relief valve.
The vent also needs to be 1 foot above grade and cannot be vented into any shared walkway that is less than 5 feet wide.
This diagram should help explain it.
Or get a Free in home consultation and have an installer who really knows “the tricks of the trade” help you find a spot for your Rinnai Tankless water heater. And as we all know installation can be tricky in Canada with existing gas codes and venting requirements. Get a Quote here
Venting a Tankless
Jan 14th
Tankless Venting
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There is a plethora of information regarding tankless systems and which is right for you. This can be an intimidating experience for any consumer, today we are going to deal with venting and choosing the right method for your application. There really is no right or wrong choice it’s that some situations will require different methods and we aim to help you choose the option that best suits your needs.
Use the information below to the best of your ability, but if you have a unique situation send us a quick email or give us a call and we would be more than happy to help out.
Tankless systems require oxygen or air to complete and maintain the combustion process. It is essential for tankless water heaters to precisely monitor and control both the incoming and exhaust gases to achieve peak efficiency. As time goes by natural and environmental occurrences build up reducing a tankless heaters ability to efficiently heat water. Different venting systems have different traits let’s look at some of the different characteristics.
Non Direct Vent Indoor (fan assisted)
- Uses a powered fan to push exhaust gases out of the house
- Pulls the air or oxygen needed from the inside of the house
- Fan powered tankless systems allow for increased flexibility in venting (vertical or horizontal)
Direct Vent Indoor (fan assisted)
- Combustion oxygen is taken from outside the home, eliminating thermal drafting issues inside.
- The Tankless water heater is sealed and doesn’t consume any air form the inside of the house.
- Venting is done with two pipes or a single concentric pipe (a pipe inside another pipe).
- Can be used in locations where appliances may be competing for the same oxygen or in cold climates where air leakage reduces home energy efficiency.
- Vertical or horizontal venting
Outdoor
- This is restricted to warm weather climates only as subzero temperatures significantly reduce efficiency and there is a risk of the unit freezing
- Air for combustion is taken directly from the environment around the unit.
- Improves home energy efficiency as excess heat is thrown off outside and reduced A/C load.
