Condensing Tankless
Uncategorized February 1st. 2010, 3:50amCondensing Tankless
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 Rinnai RC80i Condensing Tankless Water Heater High Efficiency Indoor Natural Gas  US $849.99
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 Rinnai RC98iP Natural Gas Condensing Tankless Water Heater 98 Gallons Per Min US $224.72
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 Rheem RTGH95XP liquid propane tankless condensing water heater NEW whole house US $1,095.00
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 Rinnai Condensing Tankless Water Heater Internal Natural Gas RC98iN US $1,258.99
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 Rinnai RC80e Condensing Tankless Water Heater High Efficiency Outdoor NG Gas US $764.99
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 Rinnai RC98i Internal Condensing Tankless Propane Authorized Dealer US $1,257.99
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 Rinnai 224053 39 Plastic Vent Pipe Extension for Non Condensing Tankless Water US $40.20
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 Rinnai 224051 10 Plastic Vent Pipe Extension for Non Condensing Tankless Water US $26.13
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 Rinnai RC98HPi Internal Condensing Tankless Natural Gas Authorized Dealer US $1,257.99
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 Navien TANKLESS Combi Condensing WATER HEATER Boiler DUAL PURPOSE CH 420 NG US $249.95
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 Rinnai RC98HPiP Internal Condensing Tankless Propane US $1,257.99
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 Rinnai RC98HPi Internal Condensing Tankless Propane Authorized Dealer US $1,257.99
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 Noritz NCC199 SV LP Condensing Tankless Water Heater Propane US $1,887.44
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 Navien NR 210 Condensing Tankless Water Heater 180K BT US $1,470.89
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 Rinnai RC80e External Condensing Tankless Water Heater Natural Gas US $1,060.99
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 Rinnai Condensing Tankless Water Heater External Natural Gas RC98eN US $1,288.99
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 Rinnai RC80e Condensing Tankless Water Heater High Efficiency Outdoor LP Gas US $764.99
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 Rinnai 224052 19 1 2 Plastic Vent Pipe Extension for Non Condensing Tankless US $36.18
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 Rinnai FSELB9004SP 4 Diameter 90 Elbow for 98 Series Non Condensing Tankless US $62.31
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 Rinnai 224077PP 45 Degree Vent Pipe Elbow for Condensing Tankless Water Heaters US $32.16
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 Rinnai 223177PP 21 Horiztonal Termination Kit for Condensing Tankless Water US $59.63
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 Rinnai 224087PP 10 Vent Pipe Extension for Condensing Tankless Water Heaters US $20.10
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 Rinnai 223176PP 12 Horiztonal Termination Kit for Condensing Tankless Water US $56.95
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 Rinnai 224080PP 39 Vent Pipe Extension for Condensing Tankless Water Heaters US $30.15
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 Rinnai 224079PP 19 1 2 Vent Pipe Extension for Condensing Tankless Water Heaters US $25.46
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 Rinnai FSVL3604SP 4 X 36 Vent Pipe for 98 Series Non Condensing Tankless Water US $57.62
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 Rinnai 224078PP 90 Degree Vent Pipe Elbow for Condensing Tankless Water Heaters US $22.78
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 Rinnai FSVL2404SP 4 X 24 Vent Pipe for 98 Series Non Condensing Tankless Water US $44.89
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 NORITZ 8 GPM INDOOR NATURAL GAS TANKLESS CONDENSING WATER HEATER NCC199 SV NG US $1,999.99
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 Rheem RTGH 95 DVN Condensing Tankless Water Heater US $1,270.00
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 AO Smith Condensing Indoor Tankless Water Heater Natural Gas 199000 BTU US $1,280.99
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 Bosch Liquid Propane Condensing Tankless Water Heater INTEGRA500 LP NEW US $1,159.99
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 Rinnai RC98i Internal Condensing Tankless Natural Gas Authorized Dealer US $1,257.99
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 Noritz NRC111 DV NG Condensing Tankless 84 GPM Natural Gas Water Heater US $1,689.00
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 Rheem RTGH 95DVL Drct Vnt Condensing Tankless Propane US $1,537.01
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 Rinnai RC98eP 95 Efficient Condensing Tankless Water Heater External Propane US $1,125.00
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 BOSCH NATURAL GAS CONDENSING TANKLESS WATER HEATER RESIDENTIAL 199K BTU US $2,589.99
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 Navien NR 240 Condensing Tankless Water Heater 199K BT US $1,635.49
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 NEW Navien White NR 240ALP Condensing Liquid Propane Tankless Water Heater US $1,399.00
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 Bosch Natural Gas Condensing Tankless Water Heater INTEGRA500 NG NEW US $1,069.99
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 Rinnai RC80HPi Condensing Tankless Water Heater with Isolation Valves US $1,290.00
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 Rinnai RC98HPi Tankless Condensing Water Heater 97 US $1,679.99
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 Rinnai RC80HPi Tankless Condensing Water Heater Nat US $1,499.99
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 BOSCH CONDENSING RESIDENTIAL COMMERCIAL TANKLESS WATER HEATER LP US $2,589.99
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 Rinnai RC98e Condensing Tankless Water Heater High Efficiency Outdoor LP Gas US $934.99
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 BOSCH NATURAL GAS COMMERCIAL CONDENSING TANKLESS WATER HEATER C 1210 ESC NG US $2,199.99
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 Rinnai Condensing Tankless Water Heater Internal Propane RC98iP US $1,258.99
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 Rinnai RC80HPi Tankless Condensing Water Heater LP US $1,499.99
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 Rinnai RC98HPi Tankless Condensing Water Heater LP US $1,679.99
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 Rinnai RC80iP 96 Efficient Condensing Tankless Water Heater Internal Propane US $975.00
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 NORITZ PROPANE TANKLESS CONDENSING WATER HEATER LIQUID PROPANE GAS US $1,999.99
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How much should it cost to install a tankless combi boiler?
I live in the Northeast, and I want to have a condensing tankless combi boiler installed to replace my conventional combi boiler. The gas, water, and electrical lines all run to the installation site, and the vent location is about 6 feet away. I am getting quotes for the total install for $7k to $8k, which I think is insane. What is a reasonable price for such a job?
Yeah, 7 to 8k sounds WAY TOO much. Unfortunately, your best bet is still to get other estimates, and hopefully you'll come to see the average/middle cost from these estimates very soon. Stay local with the estimates to make an apples-to-apples comparison.
To your advantage, there are plenty of local plumbing contractors seeking to give free estimates with no obligation, and using this is the best way to get an answer to your question. Here's a link to a handyman site that offers free very resourceful information to assist you in your project, and, ultimately, selecting a local plumbing contractor:
INFO on plumbing contractors:
http://yourhandymanzone.com/Your_Handyman_Zone_Free_Estimates_Plumbing.htm
I'm sure you'll find the information you need, specifically the tips, useful as it relates to being treated fairly by contractors and exploring the consumer-wise approach of getting free written estimates to find the best contractor in your area.
.
Source(s):
The Internet. Just whatever is available online and what I have on my mind, including the inclusion of relevant sites, like the one cited above that came into existence with my creative effort, which is intended to be useful. Helping people get the relevant info they want is great.
Condensing vs. Non-Condensing tankless water heaters
As Tankless water heaters become more popular here so are increasing choices of types and manufactures.
One term that is referred to lately is Condensing Tankless Water Heaters, so what is behind that?
As the term applies tankless water heaters don't have a water storage tank like the traditional water heaters. The water in a tankless unit is heated as it flows through its heat exchanger which is heated through combustion, more intense that your regular water heater.
In a typical combustion we burn the hydrogen content of the fuel and as the result hot gases are produced. One of these hot gases is steam or better water vapor. Now when these steam gases are cooled they turn into water that we generally refer to as condensation.
The condensation water is acidic (pH 3-5) and hence corrosive. It will corrode steel metals and other materials.
A Non-Condensing tankless water heater will push these hot gases through its vent to the outside. They will then cool down outside the unit. These gases have temperatures around 300 degrees F and must be vented through non-corrosive venting materials that can withstand the heat. Here is special stainless steel category 3 venting used, which is expensive.
In the combustion process fuel was burned and that energy was used to heat the water, although not all of it. Because the hot exhausting gases contain heating energy that is not used to heat the water and are wasted by exhausting them to the open. The hotter the exhaust gases are the less energy is used in heating the water and hence lower efficiency.
Non-condensing units have efficiencies around 80%, meaning around 20% of the heat is wasted and exhausted.
Condensing Tankless Water Heaters
Condensing Tankless Water Heaters extract the additional heat from the exhaust gases through various means and therefore exhaust cooler gases, usually around 100 degree F. As mentioned before cooling the exhaust gases produces condensation, in this case inside the unit. Since the exhaust gases are now much cooler a less expensive venting material can be used, mostly standard PVC schedule 40 is used as it can easily withstand the heat and the corrosively of the gases. Since we have captured the residual exhaust heat to heat the water we have achieved higher efficiency in the high 90% (up to 98%).
As a note, a Condensing unit does not always condensate, surrounding air temperature and air humidity are important factors. The manufacture claimed efficiencies are achieved mostly in labs under controlled conditions and real life values maybe lower. Since the exhaust gases have been cooled inside the unit the condensation water is collected now inside the unit. The heat exchanger is the heart of the tankless water heater. It has now to be of higher quality and non-corrosive material to withstand the corrosiveness, usually made of special stainless steel alloy.
The collected condensation water has to be neutralized before it can be drained to the outside. This can be done through special filtration or dilution.
Conclusively Condensing Tankless Water Heaters are very efficient (up to 98%), real energy savers and use inexpensive venting material. They are slightly more expensive to manufacture but are over all on par with non-condensing tankless water heaters that need to use expensive stainless steel venting materials and are less efficient (about 80%).
About the Author
Al Sagafi has extensive engineering and field experience in energy conservation and renewable energy production. He is actively involved at http://www.JustTankless.com and http://www.allied-solar.com. He holds California State General Building and Electrical Contractor licenses.
Finished Crawlspace Tour: High Efficiency HVAC, Tankless Water Heater, Spray Foam Encapsulation
