Indoor Tankless
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 Rinnai RC80i Condensing Tankless Water Heater High Efficiency Indoor Natural Gas $900.99 Time Remaining: 27d 13h 45m Buy It Now for only: $900.99 |
 AQUAH INDOOR ON DEMAND PROPANE GAS TANKLESS WATER HEATER 16 L 423 GPM $299.99 Time Remaining: 2h 22m Buy It Now for only: $329.99 |
 AOSmith Rinnai R75LSi N Tankless Indoor Water Heater 75 GPM Natural Gas $679.99 Time Remaining: 11d 21h 31m Buy It Now for only: $679.99 |
 AOSmith Rinnai R98LSi N Tankless Indoor Water Heater 98 GPM Natural Gas $764.99 Time Remaining: 11d 21h 31m Buy It Now for only: $764.99 |
 AOSmith Rinnai R75LSi P Tankless Indoor Water Heater 75 GPM Liquid Propane $679.99 Time Remaining: 11d 21h 31m Buy It Now for only: $679.99 |
 Eccotemp 40HI 63 GPM LP Indoor Tankless Water Heater $429.00 Time Remaining: 11d 16h 46m Buy It Now for only: $429.00 |
 Noritz NRC1111 SV NG Indoor Outdoor Tankless Water Heater NRC111 SV NG $1,537.44 Time Remaining: 10d 14h 35m Buy It Now for only: $1,537.44 |
 T K4 IN Takagi Tankless Water Heater Indoor LP $863.00 Time Remaining: 18d 21h 22m Buy It Now for only: $863.00 |
 New Rheem Paloma Tankless Water Heater High Alt Indoor Natural Gas PTG 53PVN H $527.99 Time Remaining: 5d 14h 35m Buy It Now for only: $527.99 |
 FACTORY SEALED TANKLESS INDOOR GE APPLIANCES GAS WATER HEATER 75 GALLON $339.90 Time Remaining: 14d 18h 48m Buy It Now for only: $339.90 |
 Rheem Indoor Direct Vent LP Tankless Water Heater RTG 84DVLP NEW $799.99 Time Remaining: 2d 20h 31m Buy It Now for only: $799.99 |
 Takagi T KJr2 IN Indoor Tanless Water Heater Propane $713.00 Time Remaining: 26d 2h 32m Buy It Now for only: $713.00 |
 BOSCH NATURAL DRAFT GAS INDOOR TANKLESS WATER HEATER HYDRO GENERATED $674.95 Time Remaining: 13d 2h 23m Buy It Now for only: $674.95 |
 Eccotemp 40HI LP Indoor Gas Water Heater Propane $494.00 Time Remaining: 26d 20h 52m Buy It Now for only: $494.00 |
 T K4 IN Takagi Tankless Water Heater Indoor NG $863.00 Time Remaining: 22d 20h 25m Buy It Now for only: $863.00 |
 NORITZ 66 GPM INDOOR NATURAL GAS TANKLESS HOME HOT WATER HEATER NR66 SV NG $719.99 Time Remaining: 19d 19h 27m Buy It Now for only: $719.99 |
 T KJr2 IN Takagi Tankless Water Heater Indoor NG $665.00 Time Remaining: 12d 16h 23m Buy It Now for only: $665.00 |
 Rheem RTG 84DVN Direct Vent Indoor NG Tankless 84 GPM $836.66 Time Remaining: 26d 18h 12m Buy It Now for only: $836.66 |
 Refurbished 74 GPM Paloma Tankless On Demand Indoor Heater Propane PTG 74PVP $649.99 Time Remaining: 5d 17h 39m Buy It Now for only: $649.99 |
 AQUAH INDOOR ON DEMAND NATURAL GAS TANKLESS WATER HEATER 12L 32 GPM $249.95 Time Remaining: 2h 22m Buy It Now for only: $274.95 |
 AO Smith Condensing Indoor Tankless Water Heater Natural Gas 199000 BTU $1,280.99 Time Remaining: 12d 20h 31m Buy It Now for only: $1,280.99 |
 Eccotemp 40HI LP Indoor Tankless Water Heater + FREE Water Saver Head 300 yr $429.00 Time Remaining: 12d 21h 6m Buy It Now for only: $429.00 |
 Noritz NCC1991 DV NG Indoor Tankless Water Heater Natural Gas NCC199 DV NG $2,095.00 Time Remaining: 1d 15h 54m Buy It Now for only: $2,095.00 |
 Rheem RTG 95DVP Direct Vent Indoor LP Tankless 95 GPM $1,036.90 Time Remaining: 27d 19h 32m Buy It Now for only: $1,036.90 |
 Noritz NRC1111 DV NG Indoor Tankless Water Heater NRC111 DV NG Natural Gas $1,537.44 Time Remaining: 10d 14h 18m Buy It Now for only: $1,537.44 |
 Rheem RTG 95DN Direct Vent Indoor NG Tankless 95 GPM $1,036.90 Time Remaining: 15d 15h 12m Buy It Now for only: $1,036.90 |
 Rinnai 75 GPM Indoor Propane Gas Tankless Water Heater $899.99 Time Remaining: 8d 14h 34m Buy It Now for only: $899.99 |
 Takagi TKJR2INNG 66 GPM Natural Gas Indoor Tankless Water Heater $590.00 Time Remaining: 16d 1h 59m Buy It Now for only: $590.00 |
 Rinnai 75 GPM Indoor Natural Gas Tankless Water Heater $899.99 Time Remaining: 8d 14h 34m Buy It Now for only: $899.99 |
 Takagi TD2INNG White 100 GPM Commercial Natural Gas Indoor Tankless Water $960.00 Time Remaining: 16d 2h Buy It Now for only: $960.00 |
 Rinnai 75 GPM Indoor Natural Gas Tankless Water Heater $949.99 Time Remaining: 20d 16h 31m Buy It Now for only: $949.99 |
 AOSmith Rinnai R98LSi N ASME Tankless Indoor Water Heater 98 GPM Natural Gas $934.99 Time Remaining: 11d 21h 31m Buy It Now for only: $934.99 |
 Waiwela By Rheem Tankless Water Heater Indoor 66 GPM Propane Gas PH25RDVSP $615.99 Time Remaining: 21d 13h 10m Buy It Now for only: $615.99 |
 Rinnai RL75iP Indoor Internal Propane Tankless Water Heater 75 GPM NEW $849.00 Time Remaining: 6d 2h 22m Buy It Now for only: $849.00 |
 AQUAH INDOOR ON DEMAND NATURAL GAS TANKLESS WATER HEATER 16 L 423 GPM $324.95 Time Remaining: 20d 19h 48m Buy It Now for only: $324.95 |
 Takagi T D2 IN Indoor Tankless Water Heater Propane $1,051.00 Time Remaining: 24d 16h 32m Buy It Now for only: $1,051.00 |
 NORITZ NR66 SV LP 66 GPM INDOOR LIQUID PROPANE TANKLESS HOME HOT WATER HEATER $719.99 Time Remaining: 18d 3h 16m Buy It Now for only: $719.99 |
 NEW RINNAI R94LSi LP PROPANE INDOOR TANKLESS WATER HEATER 1484 READ $497.03 (26 Bids) Time Remaining: 19h 56m |
 T KJr2 IN Takagi Tankless Water Heater Indoor LP $665.00 Time Remaining: 10d 19h 49m Buy It Now for only: $665.00 |
 NORITZ 83 gpm INDOOR TANKLESS WATER HEATER PROPANE GAS NR83 DVC LP $1,319.99 Time Remaining: 28d 15h 19m Buy It Now for only: $1,319.99 |
 NEW INDOOR PROPANE LP GAS 75 GPM TANKLESS WATER HEATER $799.99 Time Remaining: 22d 16h 56m Buy It Now for only: $799.99 |
 94 GPM INDOOR NATURAL GAS TANKLESS HOT WATER HEATER $1,049.99 Time Remaining: 22d 16h 58m Buy It Now for only: $1,049.99 |
 Takagi T K4 IN Indoor Tankless Water Heater Nat Gas $929.50 Time Remaining: 19d 18h 37m Buy It Now for only: $929.50 |
 Noritz N 069M DV LP Tankless Water Heater Indoor Wall Hanging Direct Vent $749.00 Time Remaining: 29d 14h 32m Buy It Now for only: $749.00 |
 New AO Smith ATI 705 P Tankless Water Heater Direct Vent Propane Gas Indoor $875.99 Time Remaining: 15d 21h 19m Buy It Now for only: $875.99 |
 Takagi TK4INLP White 80 GPM Natural Gas or Liquid Propane Indoor Tankless Water $740.00 Time Remaining: 16d 2h Buy It Now for only: $740.00 |
 NORITZ 83 gpm INDOOR HOME TANKLESS WATER HEATER NATURAL GAS NG NR83 DVC NG $1,249.99 Time Remaining: 22d 1h 21m Buy It Now for only: $1,249.99 |
 Takagi TD2INLP White 100 GPM Commercial Liquid Propane Indoor Tankless Water $960.00 Time Remaining: 16d 2h Buy It Now for only: $960.00 |
 Takagi T K4 IN Indoor Tankless Water Heater Propane $929.50 Time Remaining: 19d 18h 37m Buy It Now for only: $929.50 |
 Noritz NCC199 SV NG Indoor Outdoor Tankless Water Heater $1,887.44 Time Remaining: 1d 16h 18m Buy It Now for only: $1,887.44 |
 Takagi TK4INNG White 80 GPM Natural Gas or Liquid Propane Indoor Tankless Water $726.53 Time Remaining: 16d 2h Buy It Now for only: $726.53 |
 Navien CC210 Wall Hung Indoor Tankless Gas Space Water Heater 175K BTU CC210 N $1,275.00 Time Remaining: 6d 19h Buy It Now for only: $1,275.00 |
 Takagi TM50LP White Commercial Natural Gas or Liquid Propane Indoor Tankless $2,933.00 Time Remaining: 16d 2h Buy It Now for only: $2,933.00 |
 Noritz NC250 SV ASME NG Indoor Outdoor Tankless Water Heater Natural Gas $1,995.00 Time Remaining: 18d 18h 43m Buy It Now for only: $1,995.00 |
 Noritz N 084M ASME NG Tankless Water Heater Natural Gas Indoor Outdoor $1,295.00 Time Remaining: 29d 15h 4m Buy It Now for only: $1,295.00 |
 Bosch GL25 Ariston 2 1 2 G Point of Use Indoor Electric Mini Tank Water Heater $60.00 (10 Bids) Time Remaining: 1d 5h 3m |
 Noritz N 084M DV ASME NG Tankless Water Heater Natural Gas Indoor $1,295.00 Time Remaining: 29d 15h 11m Buy It Now for only: $1,295.00 |
 Noritz N 084M ASME LP Tankless Water Heater Propane Indoor Outdoor $1,295.00 Time Remaining: 29d 15h 6m Buy It Now for only: $1,295.00 |
 Noritz N 084M LP Tankless Water Heater Propane Indoor Outdoor Wall Hanging $1,295.00 Time Remaining: 29d 15h 14m Buy It Now for only: $1,295.00 |
 Noritz N 084M DV LP Tankless Water Heater Indoor Only Direct Vent Propane $1,055.99 Time Remaining: 10d 16h 58m Buy It Now for only: $1,055.99 |
 Noritz NCC1991 DV LP Indoor Tankless Water Heater Propane NCC199 DV LP $2,075.00 Time Remaining: 18d 18h 29m Buy It Now for only: $2,075.00 |
 Noritz NC250 DV ASME NG Indoor Direct Vent Tankless Water Heater Natural Gas $1,995.00 Time Remaining: 18d 18h 39m Buy It Now for only: $1,995.00 |
 Takagi TM50NG White Commercial Natural Gas or Liquid Propane Indoor Tankless $2,933.00 Time Remaining: 16d 2h Buy It Now for only: $2,933.00 |
 NORITZ 8 GPM INDOOR NATURAL GAS TANKLESS CONDENSING WATER HEATER NCC199 SV NG $1,999.99 Time Remaining: 14d 19h 7m Buy It Now for only: $1,999.99 |
 Noritz NC250 DV ASME LP Indoor Direct Vent Tankless Water Heater Propane $1,995.00 Time Remaining: 18d 18h 41m Buy It Now for only: $1,995.00 |
 Bosch PowerStar AE 125 Indoor Whole House Electric Tankless Water Heater $800.00 Time Remaining: 19d 19h 47m Buy It Now for only: $800.00 |
 Bosch Natural Gas Indoor Tankless Water Heater $1,099.99 Time Remaining: 12d 16h 57m Buy It Now for only: $1,099.99 |
 Navien Indoor Wall Hung Tankless Space Water Heater 175K BTU Gas CC210A N $1,435.00 Time Remaining: 3d 19h 19m Buy It Now for only: $1,435.00 |
 Takagi TH2OSNG White 90 GPM Natural Gas or Liquid Propane Indoor Tankless Water $1,200.00 Time Remaining: 16d 2h Buy It Now for only: $1,200.00 |
 Bosch PowerStar AE 125 Indoor Electric Tankless Water Heater 40 GPM $699.95 Time Remaining: 1d 15h 44m Buy It Now for only: $699.95 |
 Navien Indoor Wall Hung Tankless Space Water Heater 175K BTU Gas CC210 N $1,279.00 Time Remaining: 3d 19h 4m Buy It Now for only: $1,279.00 |
 Takagi TH2OSLP White 90 GPM Natural Gas or Liquid Propane Indoor Tankless Water $1,240.00 Time Remaining: 16d 2h Buy It Now for only: $1,240.00 |
 NEW NORITZ NR111 SV NG INDOOR OUTDOOR TANKLESS NATURAL GAS WATER HEATER 93 GPM $1,550.95 Time Remaining: 29d 15h 57m Buy It Now for only: $1,550.95 |
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Z-Flex 3" x 36" Z-Vent Straight Pipe
Sale Price: $40.00  |
Description2SVEPWCF0336 Features: -Z-Flex.-Stainless steel category II/III.-Eccotemp 40HI-LP, Eccotemp 40HI-NG.-UL approved. Dimensions: -Overall dimensions: 4'' H x 26'' W x 3'' D. |
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Eccotemp L5 Portable Tankless Water Heater and Outdoor Shower
List Price: |
DescriptionEndless hot water, in a FLASH! LP - powered Portable Tankless Water Heater. Hot water, instantly and exactly where you need it! Great for camping, cabin use, washing boats and cars, etc. Switch this Heater on and an intense flame instantly heats the water as it passes through... |
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Rheem RTE 13 Electric Tankless Water Heater, 4 GPM
List Price: |
DescriptionIdeal for Point-of-Use Applications Continuous Hot Water on Demand Energy Efficient Compact Design - Fits Almost Anywhere On-Unit Temperature Control LEDs Indicate Active Element and Standby Mode Standard 1/2" Water Connection Rugged Brass/Copper Heat Exchanger Applications Homes Apartments Condos Hospitals Hotels Boats Restaurants Offices Laboratories ... |
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Bosch GL4 Ariston 4-Gallon Point-of-Use Indoor Electric Mini-Tank Water Heater
List Price: |
DescriptionThe Ariston 4-gallon point-of-use electric mini-tank water heater eliminates the wait time for hot water to come from the sink faucet. You can install the heater independently or in-line with a larger water-heating source... |
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Camp Chef HWDS Triton Hot Water Heater
List Price: |
DescriptionYou can probably think of a dozen times when it would be helpful to have a portable, ready supply of hot water. Now you can, thanks to this handy Camp Chef portable tankless water heater. Just connect it to a pressurized water source and a bulk propane tank and you'll have on-demand hot water for keeping your equipment clean, washing Fido, cleaning your boat or just a nice hot shower during your next camping trip... |
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Coleman Hot Water-On-Demand Portable Water Heater
List Price: |
DescriptionThe Coleman(r) Hot Water on Demand(r) is designed to provide you with hot anytime while your enjoying the outdoors. Simply connect the hose to the 5-gallon water container (included) and adjust it to the desired temperature... |
Hot water on demand using tankless hot water heaters
The two systems used for heating hot water are water heaters that store a volume of pre-heated water and tankless hot water on demand systems which heat and supply hot water when you require it.
Lets look at tankless hot water on demand heaters and some of the things you need to consider prior to making your final purchase decision.
Because the water is being heated instantaneously, there are a number of important issues that need to be considered before and during system selection:
1. What is your energy source?
On demand hot water systems are power hungry. They need to heat water quickly and this takes large quantities of energy depending on their flow capacity. Hot water on demand systems can be powered by electricity, town gas or bottle gas - Propane. So the first consideration is: Does your home have the sufficient energy available? Gas should not be a problem, but it's worth getting your gas meter's flow capacity checked.
Using electricity gets more critical; you should get your power board checked to make sure you have the energy capacity to run an electric tankless hot water heater. The power requirements of these systems can be high so before you buy, get an electrician to make sure your power board can cope with the extra load, this will save you a lot of potential problems.
You will need a dedicated circuit and circuit breaker for your tankless heater as loads can be 40 amps and above.
2. How many faucets will the system be supplying?
Different outlets have different flow rates, some have small flows and others much larger. Spending some time working this out will not only influences your choice of heater but also help you determine if you are going to need multiple tankless heaters. This is not so critical for a single outlet but very important is your tankless hot water system is going to supply multiple outlets. I don't thing you want your shower running cold if someone turns on another tap.
So spending the time working out what temperature rise - flow capacity your heater is going to have to provide, is pretty critical to getting it right first time. You may find that a single tankless hotwater heater won't be able do everything and you are going to have to install multiple units.
Here are some average flow rates in gallons per minute for different outlets and appliances:
- Toilet Sink: 0.5 - 1.5 gpm
- Bath Tub: 1.5 - 3.0 gpm
- Shower: 1.5 - 3.0 gpm
- Kitchen Sink: 1.0 - 2.0 gpm
- Washing Machine: 1.5 - 3.0 gpm
- Laundry Tub: 2.5 - 3.0 gpm
- Dishwasher: 1.0 - 3.0 gpm
You can see from this that there is a lot of variability, so if you are planning on having your on demand water heater supply several outlets you need to get the flow volumes right.
3. Where are you mounting your on demand water heater?
If you are using an on demand gas water heater, you need to consider how you will vent the exhaust gas if you're installing the heater is indoors. This can be up and out through the roof or through the wall, but either way, the exhaust gas must be vented to the outside. The ducting be straight forward, or it could be complex and costly, the bottom line is you do not want the exhaust gas which contains CO, (carbon monoxide) to remain inside your home.
Electric tankless hot water heaters are much more straight forward as there are no fumes so can be mounted inside or out.
4. Distance from Faucet:
The longer the pipes the more heat loss you can experience, plus you waste more water before the hot water arrives. To get the most efficiency from your on demand water heater it's probably best to have one per bathroom. They will be smaller so use less power and can be sized to suit each bathroom. Being close to the bathroom, the pipe runs are short so very little water is wasted.
This setup is best done a build stage so the plumbing is installed to suit and the total demand energy requirements can be calculated. Up front costs might be slightly higher, but the energy savings are significant in the end.
5. Temperature Rise Ability:
Every manufacturer of on demand water heaters quote their temperature increase ability for a particular flow rate. Here is an example for one particular water heater; the Stiebel Eltron Tempra 24 Operating at 208 volts, 18 kw with a water inflow temperature of 50 F.
Outlet Temp 105 F 113 F 125.6 F
Flow in GPM 2.27 1.95 1.62
This illustrates how important it is to size your on demand water heater to your needs. If you don't you will find yourself having insufficient hot water to run multiple outlets or to run a specific appliance.
So spend some time doing the basics, working out your requirements and your energy availability and you will never run out of hot water.
About the Author
30 yrs in the building and renovation industry, specialising in histroic restoration work. Seen it all, the good the bad & the down-right shouldn't have been built! I've designed passive solar homes and am very conscious of energy efficiency and for clients to get it right at the beginning, not backtrack later. http://www.hotwaterheatersinfo.com will help you get it right.