Rated 4.4 out of 5 by 19
Rated 5.0 out of 5.0 by papalion 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 Innovator 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 Zinger 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 Junior55 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 Rastus 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 JayBarlow 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 Selutha 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 Jerry 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