2024 Thor Rize 18T vs 2025 Thor Fritz 20

Detailed Comparison

The 2024 Thor Rize 18T and 2025 Thor Fritz 20 might look similar on paper, but dig into the details and you'll find meaningful differences.

Starting with size, the Thor Rize 18T measures 21.0 ft long and tips the scales at 7,400 lbs dry weight. The Thor Fritz 20 comes in at 22.0 ft with a dry weight of 6,400 lbs.

For sleeping arrangements, the Thor Rize 18T offers room for 3 and the Thor Fritz 20 can handle 4.

Looking at self-sufficiency, the Thor Rize 18T packs 27 gal of fresh water and 200W of solar. The Thor Fritz 20 counters with 15 gal fresh water and 200W solar.

Price is often the deciding factor. The Thor Fritz 20 starts at $181,000 MSRP, while the Thor Rize 18T commands $211,000 — a $30,000 gap.

Off-grid campers should pay close attention to solar wattage, battery capacity, and tank sizes. Weekend warriors will appreciate the easier towing and quicker setup of the lighter model.

Ultimately, both rigs have their merits — test drive each one and see which floor plan speaks to your lifestyle.

When it comes to water management, tank capacity plays a major role in how long you can stay off the grid. The 2024 Thor Rize 18T holds 27 gallons of fresh water compared to 15 gallons in the 2025 Thor Fritz 20, giving it a 12-gallon advantage for extended dry camping. Gray water capacity favors the 2025 Thor Fritz 20 at 22 gallons versus 12 gallons, which directly affects how often you need to find a dump station. The 2025 Thor Fritz 20 also leads in black water capacity with 6 gallons compared to 5 gallons, an important consideration for families or full-time travelers.

Electrical systems are increasingly important as RVers rely on more electronics and appliances. Both units arrive with 200W of solar capacity, providing a solid foundation for off-grid power generation. Battery storage gives the edge to the 2025 Thor Fritz 20 with 600Ah versus 300Ah, translating to longer run times for lights, fans, and charging devices overnight. The 2025 Thor Fritz 20's 2500W inverter can handle heavier loads than the 1500W inverter in the other unit, which matters if you plan to run a microwave, coffee maker, or hair dryer without shore power.

For solo travelers and couples who value maneuverability, the 2024 Thor Rize 18T with its more compact footprint will be easier to navigate through tight campgrounds and mountain passes. Families with children should lean toward the 2025 Thor Fritz 20, which sleeps up to 4 and provides more flexibility for overnight guests. Full-time RVers who spend extended periods off-grid will benefit most from the 2024 Thor Rize 18T's power setup and the 2024 Thor Rize 18T's water reserves, as these directly impact daily comfort and independence from hookups. Weekend warriors and seasonal campers who primarily stay at full-hookup campgrounds may find that the differences in tank sizes and power systems matter less, allowing them to focus on floor plan preference and overall comfort instead.

From a value perspective, the 2025 Thor Fritz 20 at $181,000 MSRP represents a $30,000 savings over the 2024 Thor Rize 18T at $211,000, a 17% price difference. Breaking it down per sleeping position, the 2024 Thor Rize 18T costs roughly $70,333 per berth while the 2025 Thor Fritz 20 comes in at $45,250 per berth. On a cost-per-foot basis, the 2024 Thor Rize 18T runs about $10,048 per linear foot versus $8,227 for the 2025 Thor Fritz 20, which helps contextualize the value each unit delivers for its size. Since both models come from Thor, buyers can expect consistent build quality, a shared dealer network, and comparable warranty coverage, which simplifies the after-purchase ownership experience.