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Tankless Hot Water Heaters, Efficient, Effective, Endless.
Posts tagged thermal efficiency
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.
Rinnai Condensing Verses Navien Condensing
Nov 8th
These are the two heavy hitters in the high efficiency Tankless water heater field. How can you choose the correct tankless, well this article aims to help you choose between the Rinnai Tankless or the Navien Tankless.
| Brand | Rinnai | Navien | Rinnai | Navien |
| Model Nuber | RC98HP | NR240 | RC80HP | NR180 |
| Dimension | 19Wx26Hx11D | 17Wx28Hx15D | 19Wx26Hx11D | 17Wx28Hx14D |
| Weight | 71 lbs | 77 lbs | 64 lbs | 67 lbs |
| Activation Rate (GPM) | 0.4 | 0.5 | 0.4 | 0.5 |
| Min. Input (BTUs,NG) | 9,500 | 17,000 | 9,500 | 15,000 |
| Max. Input (BTUs,NG) | 199,000 | 199,000 | 157,000 | 150,000 |
| GPM @ 77 Rise | 5.0 | 5.0 | 4.0 | 3.8 |
| Thermal Efficiency | 96% | 98% | 97% | 98.8% |
| Energy Factor | 0.94 | 0.97 | 0.95 | 0.96 |
| Type of Venting | Concentric PP | Two Pipe PVC | Concentric PP | Two Pipe PVC |
This chart pits the two main tankless systems that each manufacturer produces, the only row it is missing is reliability. Unfortunately we dont have any scientific data on that but would venture to say that the Rinnai makes the more dependable tankless. This is solely based on comments that we receive here on the site regarding the two tankless manufacturers.
Rinnai RC98HPi
Jul 15th
Features
- Qualifies For Government Grants
- ENERGY STAR qualified
- Up to 96% thermal efficiency
- Condensing technology for greater efficiency and significant hot water energy savings
- Capacity to supply continuous hot water simultaneously to multiple plumbing demands
- Significant space savings over tank-style water heaters
- More sanitary hot water
- Long-lasting design and reduced risk of flooding
- Available in Natural Gas or Propane
- Flexible indoor installation options
- Meets Strict NOx Emission Rules
- 12-year heat exchanger limited warranty for residential installations (5 years on parts, 1 year on labor)
- Pair up with an air handler for efficient home heating
Specifications
- Dimensions: 19” W x 26” H x 10” D
- Weight: 71 lbs.
- Installation: Interior/Residential or Commercial
- Approved Gas Types: Natural Gas or Propane
- Minimum/Maximum Gas Rate (Input BTUs): 10,000 – 199,000
- Hot Water Capacity: 0.4 to 9.8 GPM (35° rise)
- Energy Factor: 0.94 (NG and LP)
- Electrical: AC 120 Volts – 60 Hz
- Connections:
- Gas Supply: ¾ inch MNPT
- Cold Water Inlet: ¾ inch MNPT
- Hot Water Outlet: ¾ inch MNPT
- Temperature Range (Min-Max)
- Residential: 98°-140° F
- Commercial: 98°-185° F (requires MCC-91-1 controller)
- Standard Digital Controller: MC-91-1US (included)
Documents
- Brochure : Rinnai Condensing Tankless Water Heater RC98HPi
- Owners Manuel: Rinnai RC98HPi
- Specifications sheet: RC98HPi Tankless Condensing
Get a Rinnai RC98HPi
Interested in renting or purchasing a high efficiency condensing Rinnai tankless? Get a free quote here and we will have someone come out to your home to see if it can be installed free of charge.
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.
First Rinnai Condensing Tankless
Oct 14th
Rinnai Condensing
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Rinnai’s condensing water heating technology offers all of the lifestyle benefits of traditional tankless water heaters which includes continuous hot water and the ability to run multiple hot water appliances at the same time coupled with even greater energy savings. Rinnai’s unique condensing design incorporates two innovative heat exchangers to achieve optimum water heating value from every cubic foot of natural gas or propane, and the units are ENERGY STAR qualified. The condensing process delivers up to 95 percent thermal efficiency, which translates to significant energy savings when compared to traditional gas tank water heaters. Available in four models, the condensing tankless water heaters are designed to meet the needs of mid to large sized homes and can be banked for even greater capacity. Like all Rinnai tankless water heaters, the condensing tankless water heaters contain commercial grade heat exchangers, making them an ideal choice for both residential and commercial applications.
In addition to the units’ lifestyle and energy saving benefits, the Rinnai condensing tankless water heaters utilize a unique concentric venting system that is specifically designed for gas appliance venting. This results in an overall safer and easier to install product. The concentric venting design is a safer option for consumers due to the use of a polypropylene inner pipe, which is designed to withstand varying flue temperature conditions that may be experienced over the life of a product. Also, since Rinnai’s concentric venting system uses just one pipe that is fit and locked into place without glues or solvents with expandable gasket seals at pipe joints, the risk of gaps is virtually eliminated, further contributing to the safety of the system; plus, installers appreciate the simplified, quicker installation afforded by the single pipe.
Find out more on the Rinnai condensing takless you can give our office a call or fill out the quick form and we will have some one call you back.
Takagi Tankless
Dec 10th
Takagi has been around since 1952 and has provided the tankless market with a number of firsts.
- Takagi is the First tankless water heater company specializing in tankless-only products to enter the 
North American market.
- Takagi is the First tankless water heater company to offer a tankless product (the T-H1) with an amazing thermal efficiency rating of up to 95%.
- Takagi is the First tankless water heater company to offer a “direct vent convertible” tankless model (the T-K3) which allows you to convert the unit to a direct vent unit.
Takagi is the First tankless water heater company to utilize the air-fuel ratio rod, a unique safety device.
Takagi has 10 tankless units to choose from, they range from small residential heaters that are capable of 3.0 gallons/minute to large industrial systems that are able to produce 7.9 gallons/minute. Of course most of their systems are smart link capable which doubles their output.
