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Please can you tell me if it is energy efficient to use an electric timer on a small domestic unvented hot water system or is it best left on continually

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With a newer hot water heater (manufactured in the last few years) it works rather well as the newer models are better insulated than the old ones were

it is also very important to make sure the timer is rated for the load of the water heater. Using a timer that is not rated for the load can cause a fire.

Make sure that you start the timer early enough to have the water be hot when you need it.

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Posted on Oct 27, 2009

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We are an Ace Hardware Store and we sold a water heater to a customer, and the sticker on the outside of the box that had the information for energy was discarded by us and now the customer wants the...


Dort is Reliance.
http://www.reliancewaterheaters.com/prod/elec.html
6-50 Dort is 606 series

Your Customer wants energy factor.
Pdf below shows energy factor for 606 series:
http://www.reliancewaterheaters.com/lit/spec/electric/R606E0510.pdf
55 gallon has .90 energy factor.

4500 watt water heater costs about $48 per month with electric prices at 12 cents per Kwh
http://waterheatertimer.org/Figure-Volts-Amps-Watts-for-water-heater.html

Read about energy factor:
http://www.energysavers.gov/your_home/water_heating/index.cfm/mytopic=13000
"...energy efficiency based on the amount of hot water produced per unit of fuel consumed over a typical day. This includes the following:
  • Recovery efficiency - how efficiently the heat from the energy source is transferred to the water
  • Standby losses - the percentage of heat loss per hour from the stored water compared to the heat content of the water (water heaters with storage tanks)
  • Cycling losses - the loss of heat as the water circulates through a water heater tank, and/or inlet and outlet pipes." end quote
Energy factors exist so large appliances can be compared to small appliances.
-This is like comparing aircraft-carriers to small ships.
-The purpose is so large gigantic appliances look like reasonable energy alternatives, when that is not actually true.
-The aircraft carrier could have better efficiency number than smaller ship, and it gives misleading appearance that aircraft-carrier will save the consumer money. Many of the super high-consumption 80 gallon water heaters have higher energy factor, but they consume huge amounts of energy each time operated. Simple Dort series is a better value even with lower efficiency number.
-The efficiency number is only for a new product. There is no measure showing how long that product will maintain the efficiency rating.
-And lastly, the manufacturer is putting energy factor on the product, like writing your own performance review, so who can possibly double-check the energy factor.

Dec 29, 2010 | Reliance Water Heaters

1 Answer

I have. A vanguard. Energy efficient water heater in a mobil kitchen I don't. Get any hot water



Hi,

If your electric hot water heater is not working...check out this tip about electric hot water heater problems

Electric Water Heater not Working


heatman101


,./,.

Aug 27, 2010 | Vanguard International Vanguard 82V66-2T...

1 Answer

Get a electric water heater or not?


I'd stay with the boiler, electricity to heat water is very expensive. I would not bother with a timed shutoff for the reasons you said. The water will stay hot for some time.

Jun 15, 2010 | Water Heaters

3 Answers

How do you reduce an electric bill in a all electric house?


The biggest wasters of electrical energy are Heat and A/c, water heaters,dryers and ranges. The more you insulate the less you have to cool or heat. If you live in a warm climate, consider installing an attic fan that runs on a thermostat or timer. During the summer allow it to run, during winter turn it off. Ceiling fans in rooms that are occupied create the illusion of being cooler, allowing the thermostat to be turned up.I'm not sure of the exact numbers but any thermostat setting on your a/c below 78 is more inefficient so try kicking the a/c up and the heat down. I'm a Florida boy so I can't tell you much about baseboard heaters. I know that anything that heats things up cost a lot in energy.

Consider installing a hot water heater timer. Commonly called a "Little Grey Box". Whenever your water heater is not actually being used it is still heating the water. A big waster. Once installed set the timer to cycle the water heater off during times when you commonly don't use it. Overnight,when your at work etc....

Somewhat antiquated, but a clothesline always uses 100% less energy than a clothes dryer. :) Short of this, try to fill the dryer all the way and make sure your dryer vent and lint trap are clear.

Microwaves draw 1/3 the energy of a range and run for 1/10 of the time. Microwave as many things as you can. In our house we have started microwaving canned veggies and boxed side dishes and such.

These are the big ones I've done at my house. A lot of the other things seemed to be more work than they are worth. Some actually end up costing you more if you don't own the house for decades.

There are many sites you can visit such as your local power company and possibly your local government pages.

Good luck. I'm in the same boat with the high power bill.

Mar 24, 2009 | Fahrenheat F2543 Baseboard Heater

3 Answers

Pool and Spa Heaters pros and cons


An electric heat pump needs heat available to pump. If it is 30 degrees outside, heating a spa to 102 or so, may be impossible unless the heater has some type of alternative heat source. A properly sized, gas fired heater can take care of a larger range of heating needs. A combination heat pump and natural gas heater, probably with a controller, really makes the issue more difficult, expensive, and would require a lot of study for efficient, cost effective operation. Bottom line: In really mild climates a heat pump might do the job. In cooler climates the gas heater rules. And where a wide range of temperatures and high heat demand is wanted by the customer, a gas heater is the only way to go. A backup heat pump may take years to payout.

Aug 27, 2008 | Saunacore Special Edition Residential...

2 Answers

On-Demand Water Heater


An on-demand, or tankless, water heater is a system for heating water as it passes through the pipes, usually very near the point of use. Traditional tank water heaters bring the water to approximately 140 degrees Fahrenheit (60 C), in order to ensure the water supply lasts long after the heater turns off. Since this is obviously far too hot to be pumped out of a shower of faucet, cold water is added to the mix in the pipes. Coupled with the loss of thermal energy over time, the average tank heater has an efficiency of approximately 80%. On-demand water heaters have a number of advantages over their tank-using counterparts. While tanks often degrade over time and begin leaking, the apparatus used in an on-demand water heater is much less susceptible to the burdens of age, and will often outlive the house they're installed in. The amount of energy used is a fraction of that used in a tank water heater, due to increased efficiency and a much smaller window during which a heating source is in use. While tank hot water heaters can, and often do, run out of hot water after a number of showers, on-demand heaters provide a never-ending supply of hot water, ensuring that warm water is always available when needed. A tankless water heater can cost between $500 and $1500, and they most commonly use either electric or natural gas energy to heat the water. Most mid-sized households report an energy savings of approximately 25-45% for a gas or propane heater, and up to 50% with an electric heater, over using traditional tank heaters. Water is usually set to a maximum temperature of 120 degrees Fahrenheit (49 C), though many heaters allow for custom setting of the maximum temperature via remote control. Outflow rates range from 8-14 gallons (30-53 litres) per minute. Installation for most tankless water heaters is incredibly easy, involving simple plumbing. In the case of electric heaters, all that is required for a fuel source is to plug the heater into an outlet and begin heating your water. Some modern on-demand water heaters can incorporate a solar preheating system. This system uses a traditional solar heating system and tank to bring the water nearer to the desired temperature, saving substantial energy use in the final on-demand heating. A solar preheating system costs between $500 and $800.

Aug 27, 2008 | Stiebel Eltron CK20E Electric Tankless...

3 Answers

How to Replace Water Heater


Before you rush out to buy a new one, you'll want to find out which type of water heater is most efficient. Your decision will be heavily predicated upon whether your home is set up to run an electric or a gas water heater. One general piece of advice is valid regardless: Don't assume you need to buy the same size water heater as you currently own. It is possible that you can install a smaller water heater if, in recent years, you have replaced other household appliances, such as dishwashers and washing machines. Newer products often include power and water saving features, and thus, you might be able to buy a smaller water heater that will cost less money and use less energy. Whether your requirements dictate gas or electric, learning which models are most economical is fairly straightforward. Federal regulations require that water heaters display Energy Guide labels. These labels include the Energy Factor (EF) that measures the overall efficiency of a model; the higher the number, the more efficient it is. The labels also will have a First Hour Rating (FHR) that indicates how many gallons of water that model will produce during a peak usage hour. Additionally, you can get energy savings information and rankings on some of the most popular brands of water heaters through consumer organizations and reports. A word about on-demand water heaters: On-demand water heaters, also called tankless water heaters, or spontaneous water heaters, can be fueled by either gas or electricity. This design is much more efficient than standard models. An on-demand water heater is smaller and does not keep a reservoir of heated water on hand for anticipated use. Instead, as soon as you turn on the faucet, the fuel source fires up and the hot water is delivered. This type of water heater requires some refitting during installation in order to provide powered venting and possibly a larger gas line, so it is best to hire a professional to do the job. On-demand water heaters are especially practical for small apartments or single-person households. Larger households will require multiple units. Once you have installed your new, energy efficient water heater there are even more ways to increase its efficiency. Remember to purchase insulation blankets, lower your thermostat, add an overnight shutoff timer, install heat traps, insulate your pipes, and be diligent about regular maintenance. If you take these steps, you can rest assured that you will have the most efficient type of water heater available.

Aug 27, 2008 | Emerson InSinkErator W-152 Point-Of-Use...

1 Answer

We have installed a rinnai water heater in the basement. Since it takes a little time before the hot water arrives in the kitchen or upstairs in the shower, we are wasting qite a bit of potable water every...


The only way to reduce water waste would be to have a plumber install smaller pipes coming from the water heater to each individual point of use. The normal way of plumbing a house uses a large pipe that has smaller pipes that go to each sink, tub, shower, etc. The larger the pipe, the more water is in it and the longer it will take to get hot water to where it is going. An electric tank won't save you from wasting any water unless you have a separate hot water circulation system installed. This would keep the hot water drawn out to the far ends of the plumbing system and allow the hot water to reach it's destination alot sooner. However, keeping a tank full of water hot is not economical and a circulation system basically turns your pipes into a radiator causing you to waste electricity. I know it may seem that you are wasting alot of water waiting for the hot water to get there, but in the long run you and the environment are coming out ahead due to the saved energy and efficiency of the Rinnai unit. Also just in case you were thinking of it, a circulating system is not compatible with a Rinnai water heater.

Jun 19, 2008 | Rinnai Heating & Cooling

2 Answers

RInnai Water Heater


The only way that I have found to work is to place a small electric water heater close to the point of use. Yes this does defeat some of the efficiency of having a tankless water heater but if you figure electric rates are now cheaper than gas rates in some areas, it may save you money.

Another alternative is to put a domestic circulator in-line and recirc the domestic water either all the time or install a timer.

None of these options are "low-buck" options.

15' of 1/2" copper holds less than 1 gallon of water so something is wrong with the heater if it takes 3 gallons to get hot water to the faucet.

May 28, 2008 | Rinnai Toyostove Direct Vent Heater: Laser...

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