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Who sells Heat Pumps?  .... The GE heat pump was sold to Bradford White ... Bosch and HTP are no longer making heat pumps ... so there are 4 companies to choose from and each has different offering.... with AO Smith and Rheem offering a selection that are also sold under other brand names, Steible offering their internationally marketed model, and Bradford offering the improved GE model.
All brands of heat pump water heaters are good.
All brands are expensive, large and heavy when they arrive, and heavier when filled with water.

April 2015 energy standard mandates Heat Pumps for any electric heater over 50 gallon. Home with 6 people or oversized bathtub typically requires first hour delivery 80 gallons (the amount of usable hot from one continuous draw). The 80 gallon Heat Pump can supply 80 gal first hour. But installing two ordinary 40 or 50 gallon heaters can likewise supply 80 gal first hour without the ongoing regular maintenance required of Heat Pumps: cleaning air filter each 6 months, cleaning the evaporator coil periodically, and maintaining condensate tray and drain tube to ensure no blockage.
Resources:
Two water heaters
2015-Department-of-Energy Rule on Water Heaters /pdf

All have approximately same operating parameters with only minor differences.
All brands have heat pump, hybrid, and element modes that work same way. They automatically switch to elements when heat pump cannot keep up. Each has vacation mode that keeps water temps above freezing.
Unless installed in unheated garage etc, all heat pumps use ambient temperature of home to heat water ... basically consuming energy from HVAC to heat water while claiming astounding energy savings vs heaters that do not leech energy from other sources.

EUF is NOT 'efficiency' ... it's a testing procedure set by government mandate, with manufacturers expected to do their own testing lol.
EUF varies by heating mode, which will vary throughout any day depending on mode and if elements are being used.
The variability of heating mode, questionable policy of self testing, and leeching energy from HVAC render EUF meaningless.

700-800 cubic feet is typical.... 10x10x7 room ... 2 louvered doors ... or 8" duct
"Installation in a confined space will lead to higher power consumption if adequate ventilation is not provided."
All models have optional 8" diameter duct system to bring in air supply and expel air that passes through the evaporator coil

Electronics increase vulnerability to surge on all heat pump brands.  Nearby lightning strike or simple power outage can destroy electronics.
Electronics increase repair costs for heat pumps ... and across the board for all appliances, water heaters, timers, TVs, cars etc.
Wifi offered by Rheem compromises privacy.
Install whole house surge inside main breaker box or type 3 surge at heat pump unit. Circuit can have multiple surge protection. The closer the protection is to Load, the better it protects, so type 1 inside main breaker box plus type 3 located at heat pump provides best protection.
Ordinary residential electric water heaters are mechanical, and not susceptible to surge nor exposed to same risk of repair expense and loss of function as heat pumps.
Resource:
How to install whole house surge protector

... but it urges folks to compare total cost of buying and running a heat pump vs ordinary electric heater. When the average $400 repair or maintenance bill is factored into purchase price plus the yearly operating cost divided by expected life of heat pump, it alters the saving from heat pump more in favor of ordinary tank-type electric heater .... that cost less to buy ... cost more to operate yearly ... but is smaller and lighter weight .... can be installed inside enclosed space or dusty, dirty environment with clothes piled on top ... can sit flat against wall and does not need space above heater to clean air filter ... does not need 700 square feet of air supply, louvred door, 8" ductwork, floor drain,  ... can be maintained to last indefinitely by changing anode each 3 years ... and can be repaired quickly and easily DIY using generic parts.
 Resources:
Read heat pump cost analysis
Two water heaters

... which narrows my recommendation to AO Smith/ State/ American/ Lochinvar (all AO Smith brand except sold under different names)
Aside from service manuals, the AO Smith brands come with instruction manual has solid troubleshoot section and shows 5 pages of maintenance required to keep unit in tip-top shape to support efficiency and longevity ... cutting overall cost of owning heat pump. AO Smith heat pump manuals

Corporations make claims to sell products. That's legal. That's what it takes...
... but corporations have co-opted our government into passing a mandate that we buy Heat Pumps, under the guise of saving energy if we want electric heater larger than 50 gallon, that can deliver 80 gallon first hour. **
The 'scientific studies' that show huge energy savings consider only the cost of heating water using the heat pump ... while ignoring the cost-savings analysis that should include purchase price, maintenance, cost of repairs, repairability, limited lifespan, replacement cost and leeching energy from HVAC ... and include how easy the unit is to recycle later when the heat pump becomes unserviceable, and the leaking refrigerant is released into the planet's lungs ... or your lungs to be precise.

Remember that a government rebate is you borrowing money from yourself to buy a product you wouldn't ordinarily buy ... so the question becomes... if the numbers don't add up without a rebate, why would you loan yourself money to buy it anyway?
And more to the point, who is running your government to make such a decision for you?
It might be an effort to perform grand experiments in energy ... which is remotely plausible ... except who is compiling data for the experiment? The stockholders of companies selling the products?
This applies to rooftop solar PV systems and Heat Pumps and a host of other big ticket items in 2019 that supposedly SAVE ENERGY ... go green they cry ... coal n oil are bad, puke ... ok, it's true ... except all costs are energy ...
If the solar panels push a trickle of electrons (let's say 20 amps) into the system, not enough to run the 30 amp Heat Pump water heater more than an hour or two a day maybe, and the solar panels cost more to buy than the power they generate ... then how is that saving energy?
The energy landscape is changing fast, as people demand response to global warming ... expect action after the crisis hits, whether that be massive increases in electric costs, or widespread flooding of oil refineries accompanied by plague of locust.

The only way rebates make sense is to argue that all costs are NOT energy ... that costs are far inflated and what matters is you hurry up and buy a product so ... so ... you can feel better thinking you're doing your part?? For crying out loud, move into a trailer with 6 other people without hot water if you want to do your part, except the government would never award that trailer an energy star because it has single-pane windows, despite per capita numbers that could prove it is more efficient than where you live.

If heat pumps are the miracle cure for global warming, conveniently consolidated into an expensive 300lb piece of machinery, taking up a huge space in your home, requiring maintenance and cleaning, and noisily blowing cold air while using your HVAC to heat water, then bacon can fly.

Exclusion would be heat pumps that operate in unheated garage located in naturally warm climate ... but then if the climate is warm, why isn't the water being heated using solar instead of buying a colossal machine?
Resource:
9 ways to save with water heater/ solar