Water heaters
Stiebel Eltron Tempra 24 Plus Electric Tankless Water Heater
Prices are the equipment only — the appliance, before install labour. Every product in this catalogue currently has at least one real, seller-observed equipment price (see the SKU verification and price observation notes on each product). Get contractor quotes for the install itself, especially for anything needing new electrical circuits or condensate drainage.
Stiebel Eltron's Advanced Flow Control electric tankless: 24kW, UEF 0.93, roughly 4.68 GPM at a 35°F-equivalent rise, a 3-year parts warranty (7-year limited).
Our take
This is the trade answer to the big-box RETEX-24 sitting one slot over: same 24kW output, the same 0.93 UEF, and functionally the same ~4.68 GPM at a 35°F rise, but Stiebel Eltron backs it for 3 years on parts and 7 years limited against RETEX-24's 1 year on parts. That extra coverage -- and a longer trade reputation on the flow-control electronics electric tankless buyers actually complain about -- is what the premium buys, not more hot water. If the two units perform this close on the spec sheet, the warranty term is doing most of the argument for paying more.
Best for
Buyers wanting a self-modulating 24kW electric tankless with real warranty backing, working with a plumber who already stocks Stiebel Eltron.
Watch out for
Plan the electrical work and water treatment before buying. The owner reports repeatedly mention two 50-amp breakers, annual descaling and reduced simultaneous flow when inlet water is cold.
What sellers are actually charging
The lowest in-stock, full-equipment price we've seen is $649, at Home Depot, seen 2026-08-30. Every listing from the last 30 days, newest first, is below — prices change, click through to check before you act on any of them.
| Seller | What you get | Price | Stock | Seen |
|---|---|---|---|---|
| Home Depot
big box retailer |
equipment system | $649 | in stock | 2026-08-30 |
Equipment price is not installed price. The listings above are what the hardware costs. Installation — labour, electrical, refrigerant lines, permits, removing the old system — is typically a similar amount again, and varies more between contractors than between brands. Where we have an installed figure it is labelled as such and comes from someone who actually installs.
What owners and installers report
Collected from trade forums, owner communities and video reviews. Every report links to the original. We synthesise and quote briefly — we don't republish other people's writing.
Controls and compatibility
Thermostat integration, communicating-system lock-in, firmware, and whether the equipment achieves its rated staging in practice. On tankless water heaters this also covers ignition delay and the 'cold water sandwich' effect.
Thin evidence — too few independent reports to call this a pattern. Shown because it may still be worth asking your contractor about.
Owner reports the Tempra 24 Plus's shower temperature swings about 7 degrees and water pressure fluctuates strongly during normal multi-fixture use, three months after install, with no thermostatic mixing valve fitted; the issue worsened as incoming water got colder in fall.
“the water temperature fluctuates at the shower (+/- 7 degrees) and the water pressure also fluctuates very strongly” — fullfins homeowner, 2010-10-13
Tankless woes · Terry Love Plumbing Forum · 2010-10-13 · read it in context
In the 8 exact-model owner reports retained from Home Depot, 2 mention temperature controls and hot-water delay.
Automated synthesis of 8 exact-model owner reports · Home Depot ratings · read it in context
Sources are linked so you can verify any of this yourself. We don't mirror content — Amazon in particular permits no republication of review text, so where we use retailer data we show the aggregate rating and link out. How we collect and weight this →
Compare against
Rheem Performance RETEX-24 Self-Modulating Electric Tankless Water Heater
Rheem's 24kW retail electric tankless delivers 4.68 GPM at a 35°F rise, but it needs three 40-amp double-pole breakers. It carries a 5-year heat-exchanger warranty and just 1 year on parts.
A. O. Smith Voltex X Split Heat Pump Water Heater, 47 gal
Outdoor CO2 split-system heat pump water heater introduced in August 2026, with a 47-gallon indoor tank and a model-specific UEF of 3.52.
GE Profile GeoSpring Smart Hybrid Heat Pump Water Heater, 50 gal
GE's flagship heat pump water heater, relaunched under the Profile line with FlexCAPACITY mixing and Wi-Fi control. ENERGY STAR-certified at UEF 4.50 -- the highest efficiency figure in this catalogue at any size.
GE Profile GeoSpring Smart Hybrid Heat Pump Water Heater, 80 gal
80-gallon version of the same Profile GeoSpring Smart Hybrid platform as the 50-gallon model -- same UEF 4.50, larger first-hour rating.
Before you buy this
Ask for the first-hour rating, not just tank size, and check it against your household's simultaneous demand — showers and laundry at the same time — rather than headcount alone. If it's a heat pump water heater, confirm the room has enough air volume (or a duct kit) that it won't spend winter on resistance backup, and that there's a real route for condensate, not just a nearby floor drain. Confirm the panel has spare 240V capacity. And if you're removing a gas unit that shared a flue with a furnace, ask what happens to that flue once your water heater's draft is gone — an orphaned flue can backdraft.