The number that surprises most first-time tankless buyers isn’t the $549 price tag on the unit itself, it’s the electrician invoice that shows up afterward. Real numbers from verified owners give a much clearer picture than a generic estimate, so here’s what people have actually paid.
Based on verified reviewer-reported figures, electrician costs for installing a Rheem RTEX-24 commonly range from $500 to $900, covering the three required 40-amp double-pole breaker circuits, wiring, and sometimes an auxiliary breaker box, though costs vary significantly by region and existing panel condition. This is separate from the $549 unit price and from any plumbing work needed.
Real Cost Examples From Verified Owners
One detailed verified review specifically documented paying $850 total for a licensed electrician and journeyman to complete the electrical work, including installing a new auxiliary breaker box, in approximately three hours of labor. That reviewer specifically noted rates “vary regionally” and that their figure might be higher in major metro areas.
Another verified reviewer described needing to add a sub-panel entirely because their existing panel didn’t have room for the required circuits, running nine individual 8-gauge wires through 1-inch conduit between the panel and the unit’s location, a more involved job than a simple breaker swap.
What Drives the Cost Up or Down
Several factors explain why electrician costs vary so widely for what looks like the same basic job on paper:
Existing panel capacity matters most. If your panel already has three open double-pole slots and sufficient overall capacity, the job is primarily wiring and breaker installation. If it doesn’t, adding a sub-panel or auxiliary breaker box adds both materials and labor cost.
Distance between your panel and the water heater’s location affects wire and conduit costs directly, longer runs need more material and more labor time.
Regional labor rates vary significantly. Electrician hourly rates in major metro areas typically run higher than in smaller markets, which directly affects total project cost even for identical scope of work.
Whether a full service upgrade is needed. If your home’s total electrical service (not just panel space) is insufficient, for example if you only have 100-amp service and Rheem recommends 200-amp, the project scope and cost increase substantially beyond typical breaker installation.
What’s Typically Included in Electrician Quotes
A complete quote for RTEX-24 electrical work should typically cover: running the three required circuits from your panel to the unit’s location, installing the double-pole breakers themselves, connecting the wiring to the unit, and testing the completed installation. It may or may not include a sub-panel or auxiliary breaker box, which should be itemized separately if needed.
Ask your electrician directly whether their quote assumes your existing panel has adequate capacity, or whether they’ve already confirmed that during an initial site visit, this is the single biggest variable in final cost.
How to Get an Accurate Quote
Before committing to a final quote, have an electrician physically inspect your panel rather than quoting over the phone based on a general description. This upfront visit typically costs little or nothing and can save you from an inaccurate estimate that balloons once the actual work begins and unexpected panel limitations surface.
Get at least two quotes if possible, given how much regional variation exists in reported costs, a single quote doesn’t tell you whether you’re getting a fair regional price.
Budgeting the Full Picture
When budgeting for a Rheem RTEX-24 installation, plan for the $549 unit price, $500 to $900 in typical electrician labor based on verified reviewer figures, and a buffer for potential additional costs (sub-panel, service upgrade, or longer wire runs) if your specific home’s electrical situation turns out to be more complex than average.
For the complete technical breakdown of what your electrician will actually be installing, see our electrical requirements guide.
Rheem RTEX-24 24kW 240V Electric Tankless Water Heater - Check Current Price on Amazon
The Bottom Line
Budget $500 to $900 for electrician labor on a typical Rheem RTEX-24 installation, based on real verified reviewer-reported costs, with the final number depending heavily on your existing panel capacity, regional labor rates, and whether any panel upgrades are needed.
Frequently Asked Questions
How much does it cost to hire an electrician for a Rheem RTEX-24? Based on verified reviewer-reported figures, expect $500 to $900 for the electrical work alone, separate from the unit’s $549 price, though costs vary by region and existing panel condition.
What does electrician labor for a tankless water heater installation include? Typically running the three required circuits from your panel, installing double-pole breakers, connecting the wiring to the unit, and testing the completed installation.
Why do electrician costs vary so much for the same installation? Existing panel capacity, distance between the panel and unit, regional labor rates, and whether a sub-panel or service upgrade is needed all significantly affect final cost.
Does the electrician cost include a sub-panel if I need one? Not necessarily, always confirm whether a quote includes sub-panel or auxiliary breaker box installation separately, since this adds both materials and labor cost beyond basic wiring.
Should I get multiple quotes before hiring an electrician? Yes, given the significant regional variation in reported costs, getting at least two quotes helps confirm you’re paying a fair price for your specific situation.
Is $850 a typical cost for this installation? It’s one real, verified data point from an actual reviewer, representing a reasonable middle-ground estimate, though your actual cost could be higher or lower depending on your region and panel condition.
What increases the cost of electrical installation for a tankless water heater? Needing a sub-panel, longer wire runs, a full service upgrade, or higher regional labor rates all increase costs beyond a straightforward breaker installation.
Can I reduce my electrician costs? Handling any DIY-friendly portions of the overall installation (like the plumbing connection) yourself, while reserving the electrician specifically for the electrical work, can help manage total costs.
Does the electrician cost depend on my existing panel’s amperage? Yes significantly. Homes with insufficient existing service (commonly less than 200 amps) may need a full service upgrade, a considerably larger project and cost than simply adding breakers to an existing adequate panel.
Is it worth getting an initial site visit before a full quote? Yes, having an electrician physically inspect your panel before finalizing a quote helps avoid cost surprises once the actual work begins and any panel limitations are discovered.
References
- Verified Amazon customer reviews detailing real electrician costs and installation scope for the Rheem RTEX-24, accessed July 2026: https://www.amazon.com/dp/B01MS9DVEE