2026 Comparison
Rinnai Australia vs Thermann
Compare a premium gas continuous flow brand with a value-focused challenger for households balancing reliability and budget.
Winner
Rinnai Australia
Best overall option once average cost, national reach, and support reputation are weighed together.
Average Gap
$450
Difference in average pricing across overlapping hot water systems.
Market Range
$950 - $5,100
The full low-to-high range across both providers.
Melbourne, VIC · Est. 1964
From
$1,300
Average
$2,583
Coverage
6 areas
Best for: Households prioritising reliability and quality in gas continuous flow systems for large families.
Review Rinnai AustraliaBrisbane, QLD · Est. 2013
From
$950
Average
$2,133
Coverage
5 areas
Best for: Budget-conscious homeowners wanting a reliable system without premium brand pricing.
Review ThermannSide-by-Side Price Comparison
Compare overlapping system types directly so the right price anchor is clear before you request quotes.
| Service | Rinnai Australia | Thermann | Difference |
|---|---|---|---|
| Gas Continuous Flow (installed) | $2050 | $1720 | +$330 |
| Gas Storage (installed) | $1700 | N/A | - |
| Heat Pump (installed) | $4000 | N/A | - |
| Electric Storage 160L (installed) | N/A | $1180 | - |
| Heat Pump 315L (installed) | N/A | $3500 | - |
Trust signal
Verified pricing snapshot
Pros & Cons
Rinnai Australia
WinnerPros
- ✓Premium gas continuous flow engineering
- ✓Excellent long-term reliability record
- ✓Strong service technician network
Cons
- ✗Premium pricing on all product lines
- ✗Limited electric storage range
Thermann
Pros
- ✓Competitive pricing
- ✓Good range of continuous flow options
- ✓Widely stocked through plumbing merchants
Cons
- ✗Shorter track record than Rheem or Rinnai
- ✗Warranty support network still maturing
Bottom Line
Verdict
Rinnai is typically the stronger premium pick for long-term gas performance, while Thermann usually lands a better upfront installed price.
Choose Rinnai for premium continuous flow reliability. Choose Thermann for lower-cost replacement value.
Comparison FAQ
Thermann is cheaper on average in this comparison, but the real answer depends on whether you need electric, gas, heat pump, solar, or urgent same-day replacement support.
System type, installation complexity, switchboard or gas-line work, rebates, and urgency usually affect the total cost more than a blended average across all systems.
Choose Rinnai for premium continuous flow reliability. Choose Thermann for lower-cost replacement value.