Brand: Stiebel Eltron

Model: Tempra® Model 36 Plus5

Color: Alpine White

On-demand, continuous and unlimited supply of hot water

Sleek design saves space and no venting required

Electronic switch activated for virtually silent operation. Phase- single 60 Hz. Voltage- 208 V. Wattage- 27 kW

Copper sheathed heating element housed in copper cylinder

Weight: 19 lbs (8.6 kg)

MPN: 239225

UPC: 040232668630

Height 14.52 in (369 mm)

Width 16.54 in (420 mm)

Depth 4.61 in (117 mm)

https://s3.amazonaws.com/s3.supplyhouse.com/product_files/Stiebel-239225-SizingGuide.pdf

https://s3.amazonaws.com/s3.supplyhouse.com/product_files/Stiebel-239225-InstallInstructions.pdf

https://www.stiebel-eltron-usa.com/sites/default/files/pdf/tech-specs-tempra-trend-plus.pdf

Phase: single 50/60 Hz ( NOTE: Tempra 36 Plus may be wired for balanced 3-phase 208V).

Main Service Amperage: Requires a 300A main service.

NOTE: Tempra 36 Plus may be wired for balanced 3-phase 208V, NOT unbalanced.

Voltage: 240 V

Wattage: 36 kW

Max. amp. load: 3 x 50 A

Number & min. recommended size of circuit breakers (DP): 3 x 50 A ( NOTE: This is the manufacturer's recommendation for overcurrent protection sized at 100% of load. Check local codes for compliance if necessary)

Power connection: 3/GRD

Min. recommended wire size (copper): 3 x 6/2 AWG ( NOTE: Copper must be used. Conductors should be sized to maintain a voltage drop of less than 3% under load)

Water connection 3/4“ NPT

Max. cold water temperature: 108°F (42°C)

Rated capacity: 0.39 gal (1.5 l)

Min. water flow to activate unit: 0.77 gpm / (2.9 l/min)

Max. permissible inlet temperature: 131°F (55°C)

Min. permissible pressure 30 PSI (0.2 MPa)

Max. permissible pressure 150 PSI (1.0 MPa)

Test pressure 300 PSI (2.0 MPa)

Cold water inlet temp. 

INSTALL NOTE - I am not a plumber and this stretched my mechanical DIY-er mentality, but I did install this on my own: be careful if you choose to install this on your own. I chose NOT to do the electrical upgrade required on my own - the risk of not getting that right was too high, so I paid my electrical contractor to upgrade the box for the 3 x 50 amp breakers - NO REGRETS!

I knew my 55 gal standard electric water heater was not going to last much longer due to the units age AND the fact our local city water is awful with calcium and build up. I researched the available setups and units ad nauseum, and went with this unit: the brand recognition and reputation, the size due to our house and expectation that we will eventually sell it. When I bought this unit, it was one of the larger of its type and was actually cheaper than if I went with a standard water heater to match the one I was getting rid of.

First, the drop in electric usage has about paid for 50% of the unit cost over the last year - yeah, THAT MUCH! Results will vary I am sure, but its just my wife and I in 2200 sq ft house, so the fact it runs "on demand" just makes sense. Another way to measure savings: I am all electric in this house and during extreme seasonal weather I could easily see a monthly electric bill $250-300, using either my heat pump or my additional heat source in the house. I have yet to see a monthly bill above $180 (Ohio weather from summer 90s down into the single digits in the winter).

The temp control is amazingly simply - we found 115 works fine and can take a long hot shower. But I can walk out and dial it up or down if I chose.

The install (outside of the electric) was not too bad. I have PEX plumbing in my house, so it was a no-brainer to use that with the majority of this project. I spent the money to buy heavy brass shot off valves (probably overkill) for the IN/OUT inlets on this unit. It will make a difference if I ever have to repair or replace the unit: I can easily isolate the unit from the flow of water.

Assuming we will move in the future, I will be looking for a house that either has a tankless or can be upgraded to tankless: its a great decision and works amazing.