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Discontinued

Stiebel Eltron

Model Accelera 300

Internet #203899071

Accelera 300 80 Gal. Tall Hybrid Heat Pump Water Heater

This item has been discontinued.
The Home Depot no longer carries this specific product.

  • First hour rating is 78.6 gal.
  • Superior insulation guarantees ultra-low standby losses
  • Same-day installation in most areas. Call 1-855-400-2552 by noon.

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Product Overview

Stiebel Eltron developed tankless electric water heating technology 90 years ago and continues as the industry pioneer and world leader. Our engineering excellence and high-quality manufacturing results in products fulfilling the highest expectations of performance and reliability. Thirty years of heat pump experience have taught us how to design a heat pump water heater to be as efficient as possible. The Accelera 300 extracts 80% of the heat it needs to make hot water from the energy in ambient air. We rely on the heat pump to make hot water, not on the back-up element. Heat pump draws only 500-Watt and every watt it uses generates 3 - 5-Watt of hot water. Over a year our 80 Gal. tank is more efficient than competing 50 Gal. tanks. In warm climates, the unit can be placed in a garage, where it uses the heat from the outside air; or inside the house, where it helps with air conditioning. In cooler climates, it is typically placed in a basement where it also dehumidifies the basement. Heat pump water heaters are not a new concept in Europe, and the Accelera 300, engineered and made by us in Germany, has been the largest seller there for 30 years. The Accelera 300’s ENERGY STAR energy factor is 2.51, the highest in the category.

  • Accelera 300 qualifies for federal, state, local, and utility financial incentives that may be available for heat pump water heaters
  • Single, specially-designed 1700-Watt back-up element can be disabled
  • 80 Gal. (300 l) tank is designed so 50 Gal. of hot water can be drawn before the back-up element is needed
  • Only wrap-around aluminum condenser on the market means no possible contamination of potable water
  • Glass-lined tank resists lime for longer life and the anode rod is replaceable
  • Can be powered by photovoltaic array
  • Higher the ambient air temperature where the unit is located, the greater the efficiency will be
  • Heat pump requires sufficient air in order to work and should not be installed in a closed space smaller than 10 ft. x 10 ft. x 8 ft.
  • Water heater height is approximately 75 in. tall and 1 ft. minimum additional is needed for servicing
  • Heat pump will dehumidify the space where it is installed and cool it down approximately 2-6°F (1-3°C)
  • Moisture removed from the air by the heat pump will require a condensate drain
  • Make sure the floor will support 1000 lbs., the weight of a unit filled with water
  • Do not install in a location where air temperature regularly drops below 42°F (6°C) or above 108°F (42°C)
  • All heat pump water heaters make noise roughly equivalent to a freezer while in operation and should not be installed where this would be a problem
  • Click here to check out our buying guide on water heaters
  • Inlet and outlet fittings are 1 in. NPT; condensate drain and T and P fittings are 3/4 in. NPT
  • Click here for more information on Electronic Recycling Programs

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Customer Questions & Answers

13 Questions23 Answers

Customer Questions & Answers

Accelera 300 80 Gal. Tall Hybrid Heat Pump Water Heater
Accelera 300 80 Gal. Tall Hybrid Heat Pump Water Heater

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4 answers

Average percentage savings over conventional 220 V 80 gal tank?

This question is from Accelera 300 80 Gal. Tall Hybrid Heat Pump Water Heater
Asked by
Anonymous
Canfield, Ohio
August 6, 2015
I need to know a return on investment to see how long it would take (on average) to justify the additional cost.
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Answers (4)

Asked by
Portland OR
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Home Improvement Profile: Professional
December 23, 2015
Answer: 
My friend said she saved about $40 a month once she was using the heat pump water heater. When it was off for service, then the electric bill went up $40.
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September 2, 2015
Answer: 
Try calculating your ROI by figuring on using 50 to 80% less energy than the conventional electric tank. You could also calculate by comparing the DOE annual energy figure of 1391 for this unit to the annual kWh for water heating on your electric bills. Energy Star already has an ROI table on their website which will also give you an estimate, but it uses national averages, so starting with your personal Read More
Try calculating your ROI by figuring on using 50 to 80% less energy than the conventional electric tank. You could also calculate by comparing the DOE annual energy figure of 1391 for this unit to the annual kWh for water heating on your electric bills. Energy Star already has an ROI table on their website which will also give you an estimate, but it uses national averages, so starting with your personal figures will be more accurate for you. Read Less
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Asked by
Honolulu, Hawaii
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August 30, 2015
Answer: 
This uses 28% of the energy that my old 80 gallon tank used.
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Asked by
Massachusetts
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Home Improvement Profile: Professional
August 18, 2015
Answer: 
So much depends on your personal usage and installation, but try starting this way. The DOE Energy Guide for this heat pump water heater is $167 per year. That doesn’t include equipment & installation. If that costs you $3000, divide that by 13 years, DOE's estimated lifespan, for installation cost per year of $230. Add the 2 together and you get $397 for hot water for a year. How much do you pay now per Read More
So much depends on your personal usage and installation, but try starting this way. The DOE Energy Guide for this heat pump water heater is $167 per year. That doesn’t include equipment & installation. If that costs you $3000, divide that by 13 years, DOE's estimated lifespan, for installation cost per year of $230. Add the 2 together and you get $397 for hot water for a year. How much do you pay now per year? Subtract $397 from that to get your total savings per year. Read Less
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3 answers

Does warranty require professional installation?

This question is from Accelera 300 80 Gal. Tall Hybrid Heat Pump Water Heater
Asked by
Reno
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October 24, 2015
Some product manufacturers require professional installation for their warranty to be valid. Is that the case with this unit?
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Asked by
Orfordville, Wisconsin
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January 5, 2016
Answer: 
If the install is simple and you are an accomplished DIYer I would say yes. But we had some more compicated plumbing to do and changing of electrical, so I opted for professionals.
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Asked by
Portland OR
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December 23, 2015
Answer: 
If you will be installing it in your garage, and have more than 300 square feet, with 7' tall ceilings, then it will be 'installed properly' and meet the warranty requirements.
If you enclose it in a cabinet or closet, then it will not meet the warranty requirements and cool the space it is mounted in quickly, performance will be really poor, and warranty will not cover it due to bad installation.
If you will be installing it in your garage, and have more than 300 square feet, with 7' tall ceilings, then it will be 'installed properly' and meet the warranty requirements.
If you enclose it in a cabinet or closet, then it will not meet the warranty requirements and cool the space it is mounted in quickly, performance will be really poor, and warranty will not cover it due to bad installation.
I think the suggestion that it cools the area it is mounted in by 3-5F is an understatement. It should blow out air at 10F cooler than the ambient, and will move around 200 cubic feet of air per minute, cooling a 2000 cubit foot area by 10F in 10 minutes. A open window might be required. Read Less
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November 4, 2015
Answer: 
Thank you for your recent inquiry with The Home Depot, RJ. You can view all the details for the manufacturers warranty here:
http://www.homedepot.com/catalog/pdfImages/cc/ccf8ca25-6414-49c1-a098-7d1eddee448c.pdf
Warranty is voided if improperly installed, so professional installation is recommended.
We appreciate your business and look forward to serving you in the future. Thank you for shopping Home
Read More
Thank you for your recent inquiry with The Home Depot, RJ. You can view all the details for the manufacturers warranty here:
http://www.homedepot.com/catalog/pdfImages/cc/ccf8ca25-6414-49c1-a098-7d1eddee448c.pdf
Warranty is voided if improperly installed, so professional installation is recommended.
We appreciate your business and look forward to serving you in the future. Thank you for shopping Home Depot.
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3 answers

What size house is this appropriate for ?

This question is from Accelera 300 80 Gal. Tall Hybrid Heat Pump Water Heater
Asked by
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June 24, 2015
2-4 people, 3-5 people, 4-6 people
2-4 bathrooms, 3-5 bathrooms, etc ??
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Asked by
Portland OR
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December 27, 2015
Answer: 
This has a 80 gallon 'First hour' rating, meaning that with the tank full at 120F you can draw out 80 gallons of water that will be over 105F.
This should be good for 2-4 bathrooms, and 6-8 people. Of course if they are all college students taking a shower at 6 am, you might run into a problem. If they take showers more than 30 minutes apart, then no problem recovering between showers.
Recovery should Read More
This has a 80 gallon 'First hour' rating, meaning that with the tank full at 120F you can draw out 80 gallons of water that will be over 105F.
This should be good for 2-4 bathrooms, and 6-8 people. Of course if they are all college students taking a shower at 6 am, you might run into a problem. If they take showers more than 30 minutes apart, then no problem recovering between showers.
Recovery should be about 24 gallons per hour in the heat pump only mode.
GE is building a higher capacity 'Norther Climate' HPWH that is rated to run in heat pump mode while in a 37F room (below 37 it changes to electric only mode) and is rated at 4 showers before reaching 105F. This is defined as 2 GPM draw for 8 minutes, then 5 minutes no draw, then 2 GPM X * minutes, 5 minute break until the water temp going out is less than 105F. The GE 80 gallon HPWH was able to draw out 4 times before reaching 105F.
If you need a LOT of hot water, then the Nyle CCHP Cold Climate Heat Pump is rated at many more gallons per minute, and designed to be mounted outside, with 0F ambient, it can produce many gallons of hot water each hour. It uses a 24,000 Btu compressor.
This water heater uses a compressor rated at roughly 6,000 Btu's per hour. It also is about as noisy as a microwave. Read Less
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Asked by
Southern New Jersey
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July 30, 2015
Answer: 
Of course, it depends on how much water you use, but this would be overkill for 2 people. I have a family of 6 (4 young kids) and 3 bathrooms and we do A LOT of laundry and dishes and we have not had any issues at all with running out of water. We have had it about 2 months now.
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July 21, 2015
Answer: 
It depends on water usage in your house, but the general recommendation for this unit is 3-5 people, possibly 6. Their smaller 58 gallon unit would be for 2-3 people, possibly 4. A heat pump has slower recovery than a regular tank, so a larger tank is needed IF you wish to save more money by relying on the heat pump to do the heating rather than the resistance element. As this unit has a small booster Read More
It depends on water usage in your house, but the general recommendation for this unit is 3-5 people, possibly 6. Their smaller 58 gallon unit would be for 2-3 people, possibly 4. A heat pump has slower recovery than a regular tank, so a larger tank is needed IF you wish to save more money by relying on the heat pump to do the heating rather than the resistance element. As this unit has a small booster element (to save energy), their sizing recommendation is a larger tank is better. Read Less
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2 answers

Can a whole house hot water recirculating pump be connected to this heater?

This question is from Accelera 300 80 Gal. Tall Hybrid Heat Pump Water Heater
Asked by
Orange County
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December 24, 2015
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Asked by
Orfordville, Wisconsin
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January 5, 2016
Answer: 
Don't know, but there is no need to do it.
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Asked by
Portland OR
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December 26, 2015
Answer: 
Yes, and Home Depot sells a water recirculating pump that can be used without a hot water return line, or with one if you have it. It will pump water from the hot water line into the cold line at the most distant faucet in your home, until the water into the valve is over 96F, then it will stop water Read More
Yes, and Home Depot sells a water recirculating pump that can be used without a hot water return line, or with one if you have it. It will pump water from the hot water line into the cold line at the most distant faucet in your home, until the water into the valve is over 96F, then it will stop water flow.
http://www.homedepot.com/p/Watts-Hot-Water-Recirculating-System-with-Built-In-Timer-500800/100426993?MERCH=RV-_-rv_homepage_rr-_-NA-_-100426993-_-N Read Less
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Customer Reviews

Rated 4.4 out of 5 by 19 reviewers.
Rated 5.0 out of 5.0 by Water is Really Hot! We are a Heat Pump home. Old electric water heater connected to our geothermal heat pump failed after many attempts to revive it. It is now serving as a supply tank for the new heat pump water heater. When we are heating our home, the geo unit supplies us with hot water and the Accelera acts as the back up; when we are not heating our home, the Accelera water heater supplies us with hot water. Can't tell the difference, we always have plenty of hot water no matter our activities. The recovery rate is wonderful and seemless. The electric bills have been lower, but can't tell yet if its because of the Accelera or the weather. Installation was accomplished by professionals , a plumber and an electrition. mostly because of the tandemizing with the old water heater. January 5, 2016
Rated 5.0 out of 5.0 by excellent product Had it professionally installed. Installer enjoyed the quirkiness of a german designed product in regards to fittings, but came to the conclusion, that it is superior than any other currently available hybrid O2 heater on the market. Took about 3 hours to install. Produced hot water immediately and has not stopped since. (about a month now) Electric bill is about 30% lower. Beautiful design, clean forms and it cools my garage now very nicely! It took about 30 minutes to just get it out of its packing. No louder than our refrigerator that stands next to it in the garage. Overall highly recommended. June 26, 2015
Rated 5.0 out of 5.0 by Water Heater Replacement Needed to replace an aging water heater, and tried an on-demand unit but it was hard to get the water temperature to stay consistent. Decided to go the extra $$$ for this model. It was delivered by truck to the curb at my house, and was well packaged in a wooden frame with abundant Styrofoam packing. It is a large unit and it needed to go in the basement, which was a bit of a challenge. But once there the hook-up was fairly simple and once filled with water and turned on we had hot water fairly quickly. I had to downgrade the circuit breaker from 30 to 15 amps. So far the unit has operated fairly quietly with a low amperage draw. Best part is we have no shortage of hot water! March 25, 2015
Rated 2.0 out of 5.0 by Is this a steel tank ??? I just purchased a poly tank standard element electric with a warrantee for life or second homeowner life. I am on about my 20th tank in my lifetime and all have been steel tank leakage failures almost exactly at 10 years old. What's the use of spending this kind of money for a 10 to 15 year max investment ? Fiberglass/poly tank is also amazingly insulated... Went on vacation for 7 days, got home and we took 2 showers... The thing is,, I turned the electric tank off before we left for Disney and never turned it back on till the day after we got back ! Just then noticing the lack of hot water. The math just doesn't work for a 10 year steel tank. December 28, 2015
Rated 5.0 out of 5.0 by An excellent piece of equipment I installed one of these in front of our Tempra 24 Plus to use during the summer months, and in case of a power outage. The Tempra 24 is an efficient tankless unit-- however, in comparison the heat pump unit is effectively free to run during the cooling season. I say "free to run" because this unit removes heat from the house that would normally have to be removed by the air conditioning. It also takes some of the strain off of our dehumidifier, as it cools and dehumidifies the air as it runs. In a two-person household, it lowered our electric bill approximately $40 per month. It is worth noting that everything in the house is low water usage-- from the shower heads to the washing machine to the dishwasher. I was a bit apprehensive going back to a tanked unit, as we've had poor results with previous tanked water heaters with regard to temperature regulation. I'm pleased to report this unit keeps the temperature within +/-2 degrees Fahrenheit of the set point. Our previous tanked water heaters would vary +/-5 degrees Fahrenheit or more. The tankless unit has spoiled us with its ability to produce water at exactly the temperature set point, but this heat pump unit is a very close second in its ability to maintain a steady, reliable temperature. I neglected to time how long it took to raise the temperature from cold to the set point (114 degrees F) when it was put into service, but I would estimate that it was approximately 5 hours. It's worth noting that we turned the backup element off, and the unit is running solely on the heat pump. Recovery time may be an issue if you have a big family or are filling a large tub, as the backup element is quite small. However, due to the large capacity of the unit, we have yet to run out of hot water even with multiple long showers, laundry, and the dishwasher running simultaneously. Upon purchasing the unit, I was made aware by the factory that it does make noise, unlike a traditional water heater. I would put the noise level somewhere between a refrigerator and a quiet dehumidifier. Unfortunately, I do not have a decibel meter handy. The unit is in our laundry room in our basement, and we cannot hear it over normal background noise in our house. Some things to be aware of... This is a VERY large and VERY heavy unit. Before the unit is filled with water, it is extremely top-heavy and cumbersome to move around. If you are planning on installing this unit in a basement, be sure to enlist the help of at least two strong people and a heavy-duty appliance dolly, as it weighs about 300 pounds (and, again, is extremely top-heavy). Be sure to purchase and plumb a means to drain the tank; unlike a traditional unit, it is not built with provisions to do so. Due to the very modest power requirements of this unit, you will need to switch out the existing breaker for your water tank to a 2-pole 15A breaker. The unit is also very tall (at 6'4"), and all access to the heat pump, electrical connections, and thermostats is through the top. It is possible to install the unit in a 7' basement, but you should plan ahead to make use of the space between the floor joists to facilitate access to these things. This unit produces condensate while running, so you will need to have some means to drain it-- whether through the use of a pump, floor drain, etc. Since this unit removes heat from the room it's in, Stiebel recommends that it be placed in a room that is no less than 10x10x8. Of all the units I've researched, this is the only one where the refrigerant loop does not interact directly with the water in any way. The high pressure part of the loop (hot side) wraps around the outside of the tank, whereas in other units it is either immersed in the tank or in its own small reservoir with a pump moving water across it. The entire tank is insulated very well with closed-cell foam. In the future I will conduct a test to see if it loses enough heat during the day to start the heat pump running. With our usage, it runs twice a day for less than an hour each time-- only after a major water demand. All things considered, I couldn't be more pleased with this unit and its performance, and I would recommend it to anyone. EDIT: I timed the recovery of the tank from various temperatures and the results are: from 40F incoming water to 125F ~65F ambient air temp 7.5 hours from 50F incoming water to 125F ~75 ambient air temp 5.5 hours Again, these times are heat pump only as I disabled the backup element. The hot water was completely exhausted with no residual heat remaining for both of these tests. April 21, 2015
Rated 1.0 out of 5.0 by Do not waste your money I am on my second replacement unit and it has the same issue as the first where it leaks Freon. No one knows why there are leaks but there are. have had unit for two years. Buyer beware, i know of two others who have had this same issue. November 27, 2015
Rated 5.0 out of 5.0 by Works well I have been very happy with the hot water heater. It never runs out of hot water and it has the side benifit of cooling my Garage. I will war you this heater is HUGE!!! and it needs 6 feet of space in the front and 3 feet at back for air flow. August 26, 2015
Rated 5.0 out of 5.0 by Solar panel equivalent Let's put it this way, using this water heater instead of my old water heater is the equivalent of adding 6 solar panels to my roof. September 1, 2015
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