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NYS. License Home Inspector
John Graham #16000005054 

ASHI. Certified #206772
NAHI. Certified #10-9079
NYS. Termite #C1810801
(631)243-6642
(516)942-0009

We answer are own phones! 8am-9pm
7days-a-week

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 Full Certified Member of all these Associations! 1997 - 2008

NEW! Tankless (Demand) Water Heaters
New type water heater


Save Energy






How They Work







Demand water heaters heat water directly without the use of a storage tank.
Therefore, they avoid the standby heat losses associated with storage water heaters. When a hot water tap is turned on, cold water travels through a pipe into the unit.
Either a gas burner or an electric element heats the water.
As a result, demand water heaters deliver a constant supply of hot water.
You don't need to wait for a storage tank to fill up with enough hot water. However, a demand water heater's output limits the flow rate.

Typically, demand water heaters provide hot water at a rate of 2-5 gallons (7.6-15.2 liters) per minute.
Gas-fired demand water heaters produce higher flow rates than electric ones. Sometimes, however, even the largest, gas- fired model cannot supply enough hot water for simultaneous, multiple uses in large households.
For example, taking a shower and running the dishwasher at the same time can stretch a demand water heater to its limit.
To overcome this problem, you can install two or more demand water heaters, connected in parallel for simultaneous demands of hot water. You can also install separate demand water heaters for appliances-such as a clothes washer or dishwater-that use a lot of hot water in your home.

Other applications for demand water heaters include the following:
Remote bathrooms or hot tubs
Booster for appliances, such as dishwashers or clothes washers
Booster for a solar water heating system



Although gas-fired demand water heaters tend to have higher flow rates than electric ones, they can waste energy if they have a constantly burning pilot light.
This can sometimes offset the elimination of standby energy losses when compared to a storage water heater.
In a gas- fired storage water heater, the pilot light heats the water in the tank so the energy isn't wasted.
The cost of operating a pilot light in a demand water heater varies from model to model.
Ask the manufacturer how much gas the pilot light uses for the model you're considering.
If you purchase a model that uses a standing pilot light, you can always turn it off when it's not in use to save energy.
Also consider models that have an intermittent ignition device (IID) instead of a standing pilot light.
This device resembles the spark ignition device on some gas kitchen ranges and ovens.
For homes that use 41 gallons or less of hot water daily, demand water heaters can be 24%- 34% more energy efficient than conventional storage tank water heaters.
They can be 8%- 14% more energy efficient for homes that use a lot of hot water-around 86 gallons per day. You can achieve even greater energy savings of 27%-50% if you install a demand water heater at each hot water outlet.

If you're determined to install your water heater yourself, first consult the manufacturer.
Manufacturers usually have the necessary installation and instruction manuals.
Also, contact your city or town for information about obtaining a permit, if necessary, and about local water heater installation codes.

Most tankless water heaters have a life expectancy of more than 20 years.
They also have easily replaceable parts that extend their life by many more years.
In contrast, storage water heaters last 10-15 years. Periodic water heater maintenance can significantly extend your water heater's life and minimize loss of efficiency.
Read your owner's manual for specific maintenance recommendations.


Selecting a Demand Water Heater

Demand water heaters cost more than conventional storage water heaters.
However, you may find that a demand water heater may have lower operating and energy costs, which could offset its higher purchase price.

Before buying a demand water heater, you also need to consider the following:

Size
Fuel type and availability Energy efficiency (energy factor) Estimate costs For information about specific demand water heater models, see the Product Information resources listed on the right side of this page (or below if you've printed out this page). Installation and Maintenance Proper installation and maintenance of your demand water heater can optimize its energy efficiency. Proper installation depends on many factors. These factors include fuel type, climate, local building code requirements, and safety issues, especially concerning the combustion of gas- fired water heaters. Therefore, it's best to have a qualified plumbing and heating contractor install your demand water heater. Do the following when selecting a contractor: Request cost estimates in writing Ask for references Check the company with your local Better Business Bureau See if the company will obtain a local permit if necessary and understands local building codes, etc. Improving Energy Efficiency

After your demand water heater is properly installed and maintained, try some additional energy-saving strategies to help lower your water heating bills. Some energy-saving devices and systems are more cost-effective to install with the water heater.

Other Water Heater Options Conventional storage water heaters
Heat pump water heaters
Solar water heaters
Tankless coil and indirect water heaters

Tank Water Heater vs. Demand WH

Average Annual Traditional Tank Heater Costs

- Annual hot water demand: 87 gallons / day

- 335 days / year = 29,145 gallons/ year

Power to heat up 1 gallon of water from 57 to 110F according to the multi-housing laundry association is 0.2 kWh. The annual power requirement of heating the water from 57 to 110F for an American household is: 29,145 gallons/ year x 0.2 kWh/ gallon = 5,900 kWh/ year

Annual cost of 5,900 kWh: 5,900 kWh/ year x $0.11/ kWh = $649

The cost to keep one gallon of water hot is $0.003. So, the cost to keep 21,145 gallons of water hot (standby): 21,945 gallons/ year x $0.003/ gallon = $87

So the total annual cost of heating water using a traditional tank system is $649 + $85 or $736

Average annual Tankless Water Heater Costs
* Average energy to heat water to 110F is 6.2 kW

* Average daily usage is 1.5 hours

* Daily power needed to heat the water to 110F is: 1.5 hours x 6.2 kW = 9.3 kWh

Annual costs to heat water using a tankless water heater is: 9.5 kWh/ day x 335 days/ year x $0.11/kWh = $343

The total cost of heating water using a tankless water heater is $343 + $17 or $360.

 

Tank Water Heater
vs. Demand WH


Average Annual Traditional Tank Heater Costs

- Annual hot water demand: 87 gallons / day

- 335 days / year = 29,145 gallons/ year

Power to heat up 1 gallon of water from 57 to 110F according to the multi-housing laundry association is 0.2 kWh. The annual power requirement of heating the water from 57 to 110F for an American household is: 29,145 gallons/ year x 0.2 kWh/ gallon = 5,900 kWh/ year

Annual cost of 5,900 kWh: 5,900 kWh/ year x $0.11/ kWh = $649

The cost to keep one gallon of water hot is $0.003. So, the cost to keep 21,145 gallons of water hot (standby): 21,945 gallons/ year x $0.003/ gallon = $87

So the total annual cost of heating water using a traditional tank system is $649 + $85 or $736


Average annual Tankless Water Heater Costs

* Average energy to heat water to 110F is 6.2 kW

* Average daily usage is 1.5 hours

* Daily power needed to heat the water to 110F is: 1.5 hours x 6.2 kW = 9.3 kWh

Annual costs to heat water using a tankless water heater is: 9.5 kWh/ day x 335 days/ year x $0.11/kWh = $343

The total cost of heating water using a tankless water heater is $343 + $17 or $360.

If you would like to arrange for any of our services
Please call us at:(631) 243-6642 or (516) 942-0009
We answer our own phones!
Out of area? call Toll free at 1-877 814-4775
(call 7 days a week from 8 Am to 9 Pm)
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NYS. License Home Inspector
John Graham #16000005054
ASHI. Certified #206772
NAHI. Certified #10-9079
NYS. Termite #C1810801

Toll free: 877-814-4775
(516) 942-0009 
(631) 243-664
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