How to Identify Your Rheem or Stiebel Hot Water System Model

If your hot water system needs repair, replacement, or warranty support, the first thing you’ll be asked is the model number.

For Rheem and Stiebel Eltron systems, identifying the correct model is essential — and it’s often easier than you think.

This guide explains where to find your model details and why getting it right matters.

Why Your Hot Water System Model Matters

Your system’s model determines:

• The correct replacement parts

• Warranty eligibility

• Energy efficiency and capacity

• Whether repairs are possible or a replacement is required

Even systems that look identical can have very different internal components.

How to Identify Your Rheem Hot Water System Model

Rheem systems have a data plate attached to the unit.

Where to look

• On the side of the tank

• Near the lower front panel

• Sometimes behind the access cover

What to look for

• Model number

• Serial number

• Capacity (litres)

• Energy type (electric, gas, heat pump)

• Manufacturing date

The model number is the most important detail when organising service or replacement.

How to Identify Your Stiebel Eltron Hot Water System Model

Stiebel Eltron units also display a rating label.

Where to look

• On the side of the unit

• Under the front cover (some models)

• Near the electrical connection point

What to look for

• Model name (e.g. WWK, DHF, SHW series)

• Capacity or output rating

• Electrical requirements

• Serial number

Stiebel models vary significantly, so accurate identification is critical before quoting or repairs.

Common Reasons We Need the Model Number

We usually ask for the model when:

• Diagnosing inconsistent hot water

• Quoting repairs or replacement

• Checking warranty coverage

• Assessing upgrade options

• Ordering manufacturer-specific parts

Providing the model upfront helps avoid delays and repeat visits.

What If the Label Is Missing or Damaged?

If the data plate is unreadable:

• Take clear photos of the unit from multiple angles

• Note whether it’s electric, gas, or heat pump

• Estimate the tank size if possible

• Record the installation location and age (if known)

In many cases, we can still identify the system during an on-site inspection.

When Should a Hot Water System Be Checked?

We recommend checking your system if:

• Hot water runs out quickly

• Water temperature fluctuates

• The unit is over 8–10 years old

• You notice leaks, corrosion, or unusual noises

Early inspection can help determine whether a repair is worthwhile or if replacement makes more sense.

Need Help Identifying or Servicing Your System?

If you’re unsure which Rheem or Stiebel Eltron model you have, we can help identify it and provide clear advice on next steps.

👉 Book a hot water system inspection

We’ll assess the unit, confirm the model, and talk you through repair or replacement options.