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Water Demand
Water Demand

What is a tankless water heater?

Tankless water heater, as the stated in the name, is the kind of water heating system that provides hot water without using a tank. Also known as instantaneous water heater, the heater heats the water on demand. When the water tap is turned on, cold water flows through the heating device and delivers hot water on the userÂ’s end.

Tankless water heater works rather differently from the conventional water heating system – it does not require a tank for hot water storage and it is more environment friendly as the system avoids standby energy consumption.

Shopping for tankless water heater?

There are quite a few consideration points when it comes to selecting the right tankless water heater. Power supplies, capacity, and application are some of the majors that shoppers cannot avoid.

Power supplies with tankless water heater

Tankless water heaters are normally powered by electrical, gas, or propane. Different power types are designed for different usage.

For example electrical tankless water heaters have lower power efficiency however it is easier to be installed. On the other hand, Gas or propane fueled tankless water heaters have better power efficient but more complex installation process.

Application of tankless water heater

When you are shopping for tankless water heater, you will have to be aware that some of these heaters are for single point application and some with multiple point application. Single point application means you will only have one single outlet for hot water (your shower tap for example); while multiple points enables you to have more hot water outlet (for example, shower and basin taps).

Capacity of tankless water heater

Tankless water heaters are sized according to its maximum temperature rise possible at a given flow rate. Getting an oversized heater is a waste of money; while heaters with too low capacity will not supply sufficient hot water.

WhatÂ’s the maximum water usage (gallon per minute, GPM) in one time? WhatÂ’s the cold water temperature in your local area? WhatÂ’s the necessary temperature rise? These are questions to be answered before making your buying decision.

Wrapping things up...

Electrical tankless water heaters priced about $100 - $200; while gas powered water heaters takes $800 - $900. It's not a cheap buy for your home thus careful considerations are needed before you make your purchase.

More consumer guide on tankless water heaters [http://www.dumbshoppers.com/tankless-water-heater].

Articles by Phil Anderson.

What do you know about the system of hot water on demand? Would you recommend it?

My mother is concidering putting in the Hot water on Demand system. What would be the cost of this? Can someone give me some general information?

Additional Information
-There are just two of us home, my mother and I

Basic operation is that your water is heated as you use it by a gas burner. A normal hot water tank stores hot water and is less efficient since it has to keep the water hot at all times. Although on-demand heaters are efficient they can have many maintenance problems which could offset your savings. The first poster was correct about the water hardness.

Hot water on demand experiment

AQUAH ON-DEMAND PROPANE GAS TANKLESS WATER HEATER,12 L, 3.2 GPM
AQUAH ON-DEMAND PROPANE GAS TANKLESS WATER HEATER,12 L, 3.2 GPM
Paypal   US $249.95
AQUAH 16L (4.23 GPM) ON-DEMAND NG NATURAL GAS TANKLESS WATER HEATER
AQUAH 16L (4.23 GPM) ON-DEMAND NG NATURAL GAS TANKLESS WATER HEATER
Paypal   US $299.99
AQUAH 10L (2.65 GPM) ON-DEMAND NATURAL GAS TANKLESS GAS WATER HEATER
AQUAH 10L (2.65 GPM) ON-DEMAND NATURAL GAS TANKLESS GAS WATER HEATER
Paypal   US $224.95
AQUAH ON-DEMAND NATURAL GAS NG TANKLESS WATER HEATER,12 L, 3.2 GPM
AQUAH ON-DEMAND NATURAL GAS NG TANKLESS WATER HEATER,12 L, 3.2 GPM
Paypal   US $249.95
AQUAH ON-DEMAND PROPANE GAS TANKLESS WATER HEATER,12 L, 3.2 GPM
AQUAH ON-DEMAND PROPANE GAS TANKLESS WATER HEATER,12 L, 3.2 GPM
Paypal   US $249.95
AQUAH ON-DEMAND PROPANE GAS TANKLESS WATER HEATER 10L, 2.65 GPM
AQUAH ON-DEMAND PROPANE GAS TANKLESS WATER HEATER 10L, 2.65 GPM
Paypal   US $224.95
AQUAH INDOOR ON-DEMAND PROPANE GAS TANKLESS WATER HEATER 12L, 3.2 GPM
AQUAH INDOOR ON-DEMAND PROPANE GAS TANKLESS WATER HEATER 12L, 3.2 GPM
Paypal   US $249.95
AQUAH INDOOR ON-DEMAND PROPANE GAS TANKLESS WATER HEATER 16 L, 4.23 GPM
AQUAH INDOOR ON-DEMAND PROPANE GAS TANKLESS WATER HEATER 16 L, 4.23 GPM
Paypal   US $329.99
AQUAH INDOOR ON-DEMAND NATURAL GAS TANKLESS WATER HEATER 16 L, 4.23 GPM
AQUAH INDOOR ON-DEMAND NATURAL GAS TANKLESS WATER HEATER 16 L, 4.23 GPM
Paypal   US $299.99
AQUAH INDOOR ON-DEMAND NATURAL GAS TANKLESS WATER HEATER 12L, 3.2 GPM
AQUAH INDOOR ON-DEMAND NATURAL GAS TANKLESS WATER HEATER 12L, 3.2 GPM
Paypal   US $249.95
ON-DEMAND LPG PROPANE GAS TANKLESS WATER HEATER 16L, 4.23GPM
ON-DEMAND LPG PROPANE GAS TANKLESS WATER HEATER 16L, 4.23GPM
Paypal   US $297.95
ON DEMAND NATURAL GAS TANKLESS WATER HEATER 3.2 GPM, 12L
ON DEMAND NATURAL GAS TANKLESS WATER HEATER 3.2 GPM, 12L
Paypal   US $269.95
NEW Coleman Hot Water on Demand Shower Head 48
NEW Coleman Hot Water on Demand Shower Head 48" Hose!
Paypal   US $5.99
ON-DEMAND TANKLESS WATER HEATER NATURAL GAS 10L
ON-DEMAND TANKLESS WATER HEATER NATURAL GAS 10L
Paypal   US $219.95
ON DEMAND NATURAL GAS TANKLESS WATER HEATER 3.2 GPM, 12L
ON DEMAND NATURAL GAS TANKLESS WATER HEATER 3.2 GPM, 12L
Paypal   US $269.95
AQUAH 16L (4.23 GPM) ON-DEMAND PROPANE LPG GAS TANKLESS WATER HEATER NEW
AQUAH 16L (4.23 GPM) ON-DEMAND PROPANE LPG GAS TANKLESS WATER HEATER NEW
Paypal   US $299.99
AQUAH 16L (4.23 GPM) ON-DEMAND NG NATURAL GAS TANKLESS WATER HEATER
AQUAH 16L (4.23 GPM) ON-DEMAND NG NATURAL GAS TANKLESS WATER HEATER
Paypal   US $299.99
AQUAH 10L (2.65 GPM) ON-DEMAND NATURAL GAS TANKLESS GAS WATER HEATER
AQUAH 10L (2.65 GPM) ON-DEMAND NATURAL GAS TANKLESS GAS WATER HEATER
Paypal   US $224.95
AQUAH ON-DEMAND NATURAL GAS NG TANKLESS WATER HEATER,12 L, 3.2 GPM
AQUAH ON-DEMAND NATURAL GAS NG TANKLESS WATER HEATER,12 L, 3.2 GPM
Paypal   US $249.95
AQUAH ON-DEMAND PROPANE GAS TANKLESS WATER HEATER,12 L, 3.2 GPM
AQUAH ON-DEMAND PROPANE GAS TANKLESS WATER HEATER,12 L, 3.2 GPM
Paypal   US $249.95
Camp Chef Triton Hot Water on Demand propane heater NEW
Camp Chef Triton Hot Water on Demand propane heater NEW
Paypal   US $76.13
ON-DEMAND LPG PROPANE GAS TANKLESS WATER HEATER 16L, 4.23GPM
ON-DEMAND LPG PROPANE GAS TANKLESS WATER HEATER 16L, 4.23GPM
Paypal   US $297.95
ON-DEMAND TANKLESS WATER HEATER NATURAL GAS 10L
ON-DEMAND TANKLESS WATER HEATER NATURAL GAS 10L
Paypal   US $219.95
On Demand Alaska Propane Tankless Hot Water Heater LLC
On Demand Alaska Propane Tankless Hot Water Heater LLC
Paypal   US $349.95
NEW COLEMAN HOT WATER SHOWER ATTACHMENT FOR HOT WATER ON DEMAND
NEW COLEMAN HOT WATER SHOWER ATTACHMENT FOR HOT WATER ON DEMAND
Paypal   US $3.51
~RV Tankless Hot Water Heater - Propane Gas - 4.3 GPM On Demand - FREE FEDEX
~RV Tankless Hot Water Heater - Propane Gas - 4.3 GPM On Demand - FREE FEDEX
Paypal   US $326.65
~RV Tankless Hot Water Heater - Propane Gas - 2.7 GPM - On Demand - FREE FEDEX
~RV Tankless Hot Water Heater - Propane Gas - 2.7 GPM - On Demand - FREE FEDEX
Paypal   US $230.89
Tankless Hot Water Heater - Propane Gas - 1.5 GPM - Marey On Demand - FREE FEDEX
Tankless Hot Water Heater - Propane Gas - 1.5 GPM - Marey On Demand - FREE FEDEX
Paypal   US $175.99
Tankless Hot Water Heater - Natural Gas - 1.5 GPM - Marey On Demand - FREE FEDEX
Tankless Hot Water Heater - Natural Gas - 1.5 GPM - Marey On Demand - FREE FEDEX
Paypal   US $175.99
~RV Tankless Hot Water Heater - Propane Gas - 1.5 GPM - On Demand - FREE FEDEX
~RV Tankless Hot Water Heater - Propane Gas - 1.5 GPM - On Demand - FREE FEDEX
Paypal   US $175.99
KitchenAid Instant On Demand Water Dispenser Heater Model# KHWS160VWH0
KitchenAid Instant On Demand Water Dispenser Heater Model# KHWS160VWH0
Paypal   US $35.00
On Demand Alaska Propane Tankless Hot Water Heater LLC
On Demand Alaska Propane Tankless Hot Water Heater LLC
Paypal   US $349.95
ON-DEMAND TANKLESS WATER HEATER NATURAL GAS 10L
ON-DEMAND TANKLESS WATER HEATER NATURAL GAS 10L
Paypal   US $219.95
Marey® ECO110 Electric 3 GPM Tankless 11L On-Demand Hot Water Heater Free FEDEX
Marey® ECO110 Electric 3 GPM Tankless 11L On-Demand Hot Water Heater Free FEDEX
Paypal   US $169.00
AQUAH ON-DEMAND PROPANE GAS TANKLESS WATER HEATER 10L, 2.65 GPM
AQUAH ON-DEMAND PROPANE GAS TANKLESS WATER HEATER 10L, 2.65 GPM
Paypal   US $224.95
AQUAH INDOOR ON-DEMAND PROPANE GAS TANKLESS WATER HEATER 12L, 3.2 GPM
AQUAH INDOOR ON-DEMAND PROPANE GAS TANKLESS WATER HEATER 12L, 3.2 GPM
Paypal   US $249.95
AQUAH INDOOR ON-DEMAND PROPANE GAS TANKLESS WATER HEATER 16 L, 4.23 GPM
AQUAH INDOOR ON-DEMAND PROPANE GAS TANKLESS WATER HEATER 16 L, 4.23 GPM
Paypal   US $329.99
AQUAH INDOOR ON-DEMAND NATURAL GAS TANKLESS WATER HEATER 16 L, 4.23 GPM
AQUAH INDOOR ON-DEMAND NATURAL GAS TANKLESS WATER HEATER 16 L, 4.23 GPM
Paypal   US $299.99
AQUAH INDOOR ON-DEMAND NATURAL GAS TANKLESS WATER HEATER 12L, 3.2 GPM
AQUAH INDOOR ON-DEMAND NATURAL GAS TANKLESS WATER HEATER 12L, 3.2 GPM
Paypal   US $249.95
ON-DEMAND LPG PROPANE GAS TANKLESS WATER HEATER 16L, 4.23GPM
ON-DEMAND LPG PROPANE GAS TANKLESS WATER HEATER 16L, 4.23GPM
Paypal   US $297.95
ON DEMAND NATURAL GAS TANKLESS WATER HEATER 3.2 GPM, 12L
ON DEMAND NATURAL GAS TANKLESS WATER HEATER 3.2 GPM, 12L
Paypal   US $269.95
ON-DEMAND LPG PROPANE GAS TANKLESS WATER HEATER 16L, 4.23GPM
ON-DEMAND LPG PROPANE GAS TANKLESS WATER HEATER 16L, 4.23GPM
Paypal   US $297.95
Whirlpool Demand Controlled water softener
Whirlpool Demand Controlled water softener
Paypal   US $250.00
Coleman Camping Propane Hot Water Heater On Demand Shower & More
Coleman Camping Propane Hot Water Heater On Demand Shower & More
Paypal   US $99.00
MAREY ★ 16 LPM - 4.2 GPM ★ PROPANE GAS ★ TANKLESS WATER HEATER ON DEMAND★GA16LP
MAREY ★ 16 LPM - 4.2 GPM ★ PROPANE GAS ★ TANKLESS WATER HEATER ON DEMAND★GA16LP
Paypal   US $326.65
MAREY ★16 LPM - 4.2 GPM ★ NATURAL GAS ★ TANKLESS WATER HEATER ON DEMAND ★ GA16NG
MAREY ★16 LPM - 4.2 GPM ★ NATURAL GAS ★ TANKLESS WATER HEATER ON DEMAND ★ GA16NG
Paypal   US $326.65
MAREY ★ 5 LPM - 1.3 GPM ★ PROPANE GAS ★ TANKLESS WATER HEATER ON DEMAND ★ GA5LP
MAREY ★ 5 LPM - 1.3 GPM ★ PROPANE GAS ★ TANKLESS WATER HEATER ON DEMAND ★ GA5LP
Paypal   US $175.99
MAREY★11 LPM - 3 GPM★ELECTRIC★TANKLESS WATER HEATER ON DEMAND★HOT WATER★ECO110
MAREY★11 LPM - 3 GPM★ELECTRIC★TANKLESS WATER HEATER ON DEMAND★HOT WATER★ECO110
Paypal   US $185.90
NEW Coleman Hot Water on Demand Shower Head 48
NEW Coleman Hot Water on Demand Shower Head 48" Hose!
Paypal   US $5.99
MAREY 10 LPM - 2.7 GPM NATURAL GAS TANKLESS WATER HEATER ON DEMAND GA10NG
MAREY 10 LPM - 2.7 GPM NATURAL GAS TANKLESS WATER HEATER ON DEMAND GA10NG
Paypal   US $230.90
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Another great place to shop for Water Demand products is Amazon. They have more than just books!

Thermos Stainless Steel Tea Tumbler with Infuser Thermos Stainless Steel Tea Tumbler with Infuser

...
Cuisinart CHW-12 Coffee Plus 12-Cup Programmable Coffeemaker with Hot Water System, Black/Stainless Cuisinart CHW-12 Coffee Plus 12-Cup Programmable Coffeemaker with Hot Water System, Black/Stainless
$93.99

Fresh, delicious coffee is only the beginning! This incredible hot beverage machine comes complete with all your favorite features, like 24 hour programmability, carafe temperature control , Brew Pause, and the ultra-convenient Hot Water System. Now, youre never more than a minute away from enjoying your favorite instant soup, hot coca, tea and more. Coffeemaker includes a charcoal water filter an...
Cuisinart DGB-550BK Grind-and-Brew 12-Cup Automatic Coffeemaker, Black/Brushed Metal Cuisinart DGB-550BK Grind-and-Brew 12-Cup Automatic Coffeemaker, Black/Brushed Metal
$62.99

A nice addition to any modern kitchen%2C this 12%2Dcup automatic coffeemaker automatically grinds whole beans right before brewing to produce a fresh and flavorful pot of coffee%2E The 24%2Dhour fully programmable unit allows for %22wake%2Dup%22 coffee%2C plus its brew%2Dpause function makes it simple to enjoy a cup of coffee before the end of the brewing cycle%2E The included 60%2Dounce stainless...
Elmo's World - Flowers, Bananas & More Elmo's World - Flowers, Bananas & More
$3.50

Flowers, Bananas & More--so titled, presumably, because Flowers, Bananas & Hair sounds kind of yucky--culls everybody's favorite 3-year-old monster's investigations of those things in a 50-minute tape. The Flowers episode cuts away from Elmo's crayon-filled playroom to follow a real, live boy in his quest to grow a plant. Through Elmo's lively voiceover, we learn that by filling a glass with a pap...
Krampouz CEFIA2 Electric Crepe Griddle - Passion Krampouz CEFIA2 Electric Crepe Griddle - Passion

Non-stick griddle with stainless steel frame. Can produce four 5 1/2" diameter crêpes at one time. Ideal for making pancakes, small crêpes & galettes, tacos, and blinis. Adjustable thermostat. Indicator light. 2 ladles, 6 spatulas and one instruction manual with 16 recipes included. FOR DOMESTIC USE ONLY Requires it's own circuit - 15 amp...
Fire and Water Fire and Water

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Ties of Blood And Water Ties of Blood And Water
$1.99

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You Oughta Be Savin' Water You Oughta Be Savin' Water
$1.99

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Wagner 915 1,500-Watt On-Demand Power Steamer and Cleaner Wagner 915 1,500-Watt On-Demand Power Steamer and Cleaner
$150.00

The Wagner 915 power steamer can be used in every room in your home. It uses a pressurized steam system to complete repair or renovation jobs like removing wallpaper and also cleans and sanitizes your home from top to bottom. Use it to clean grills, greasy stovetops, bathroom tile, and more. The power steamer works without chemicals, so it's safe and non-toxic and won't leave behind any messy resi...
Swift Response FSR20 Liquid Rubber Sealant & Coating - Stop Leaks Fast!, As Seen On TV, 2 Pack Swift Response FSR20 Liquid Rubber Sealant & Coating - Stop Leaks Fast!, As Seen On TV, 2 Pack
$24.34

THE ORIGINAL FLEX SEAL! As seen on TV, Stop Leaks Fast!...

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