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Rinnai Solar Hot Water Repairs – Gold Coast to Brisbane
Fast, reliable repairs for Rinnia solar hot water systems.
If your Rinnai solar hot water system is only lukewarm, leaking, or not boosting properly, Todd’s Plumbing & Electrical can help.
We repair and service the popular Rinnai Sunmaster and Prestige solar ranges, including close-coupled roof-mounted systems, split systems with ground tanks, and low-profile roof units, with both gas and electric boosting.
With 20+ years on the Gold Coast, our licensed plumbers understand how local conditions, hard water, salty air and roof layouts affect Rinnai systems – and how to get them running efficiently again.
📞 Same-day Rinnai solar repairs: 0482 080 423
Rinnai Solar Hot Water Repairs – Gold Coast to Brisbane
Fast, reliable repairs for Rinnia solar hot water systems.
If your Rinnai solar hot water system is only lukewarm, leaking, or not boosting properly, Todd’s Plumbing & Electrical can help.
We repair and service the popular Rinnai Sunmaster and Prestige solar ranges, including close-coupled roof-mounted systems, split systems with ground tanks, and low-profile roof units, with both gas and electric boosting.
With 20+ years on the Gold Coast, our licensed plumbers understand how local conditions, hard water, salty air and roof layouts affect Rinnai systems – and how to get them running efficiently again.
📞 Same-day Rinnai solar repairs: 0482 080 423
Rinnai Solar Systems We Service
We work on the full range of domestic Rinnai solar hot water systems commonly installed in Australian homes:
Rinnai Sunmaster Close-Coupled Systems
Tank and panels mounted together on the roof
Uses natural thermosiphon (hot water rises, cold water falls) to circulate water
Simple, compact design found across many older and newer homes.
Rinnai Prestige Close-Coupled Systems
Premium roof-mounted solar with flat-plate collectors
Often paired with a gas booster for reliable hot water year-round.
Rinnai Split Solar Systems (Sunmaster / Prestige)
Roof-mounted collectors with a storage tank at ground level
Pumped circulation controlled by a solar controller and sensors
Available with electric or continuous-flow gas boosters.
Low-Profile Roof-Mounted Systems
Sleeker roof-mounted systems designed to sit closer to the roof line
Suited to homes that want solar benefits with less visual impact.
If you’re not sure which model you have, we can usually identify it from a quick photo of the tank and collectors, or the data plate.
Common Rinnai Solar Hot Water Problems (and How We Fix Them)
This section is written for both humans and answer engines: clear symptoms, likely causes and the fixes Todd’s provides.
1. No Hot Water or Only Lukewarm Water
Typical syptoms:
Showers are cold or just lukewarm
Hot water runs out very quickly, especially in the morning or at
Likely causes:
Failed booster element or thermostat (electric-boosted systems)
Solar pump not circulating water (split systems)
Airlocks or blockages in solar pipework
Faulty temperature sensors or controller
Incorrect tariff or timer settings for the booster
What Todd's does:
Test booster element, thermostat and electrical supply
Check solar pump operation, flow rate and temperature difference across collectors
Bleed air from the solar circuit and clear blockages
Replace faulty sensors or repair controller wiring
Reconfigure timers and boosting cycles so you have reliable hot water when you actually need it
2. Rinnai Solar Not Heating on Sunny Days
Typical symptoms:
Tank temperature stays low even after full sun
Roof collectors feel cool to touch when they should be warm
Likely causes:
Circulation pump failure or seizing
Sensor faults causing the controller not to call for pumping
Blocked or partially blocked pipework
Incorrect installation or flow direction
What we do:
Test pump power draw and replace failed pumps
Check controller settings and sensor readings
Flush pipework and restore proper flow
Ensure system is piped and configured according to Rinnai specifications
3. Leaking Solar Panels, Pipes or Tank
All hot water systems, including Rheem solar, have a PTR (pressure & temperature relief) valve. A small amount of discharge is normal, but continuous running isn’t.
Typical symptoms
Wet patches on the roof around collectors
Drips or rust stains down walls or gutters
Puddles under the ground tank or around valves
Likely causes:
Corrosion inside the storage tank
Cracked or damaged collectors, sometimes from thermal shock or physical damage
Perished roof flashings, fittings or unions
High mains pressure stressing valves and joints
What Todd's does:
Pressure-test the system to pinpoint the leak
Repair or replace roof fittings, unions, valves and sections of copper pipe
Replace damaged collectors where required
If the tank is badly corroded, we’ll provide clear options and pricing for a new solar, heat-pump or high-efficiency electric/gas system
4. PTR Valve Constantly Dripping
Every Rinnai system has a pressure and temperature relief (PTR) valve. A small amount of discharge when heating is normal; constant running is not.
Typical symptoms:
Continuous trickle or flow from the PTR drain line
Hissing or steaming near the valve on hot days
Likely causes:
Excessive pressure in the tank
A worn or faulty PTR valve
High mains pressure with no limiting valve
Overheating due to boosting or stagnation in the collectors
Our fix:
Test system pressure and tank temperature
Replace the PTR valve with a compliant new unit
Install or check pressure limiting valves on mains supply
Adjust boosting and system control so temperatures stay in the safe operating range
5. Booster Not Working (Electric or Gas)
Typical symptoms:
Hot water is okay after sunny days, but cold after cloudy or rainy weather
Water never gets properly hot at night
Likely causes:
Failed electric element or thermostat
Tripped breaker or faulty isolator
On gas-boosted systems: gas supply issue, ignition fault or lockout in the continuous-flow booster
What Todd does:
Test and replace faulty elements, thermostats, fuses or breakers
Check wiring, isolators and booster controls
For gas boosters, verify gas supply and ignition, and reset or repair the booster as needed
Re-set times and temperature settings so boosting supports your household’s usage patterns
6. Error Codes, Flashing Lights or Controller Problems
Modern Rinnai solar systems use controllers that can show error indications when there’s a problem with sensors, pumps or system temperature.
What we do:
Read and interpret error codes or indicator lights
Test thermistors, sensors and wiring continuity
Repair loose connections and replace failed components
Reset the system and confirm it’s cycling correctly under real operating conditions
7. Noisy, “Boiling” or Overheating Solar Collectors
Typical symptoms:
Gurgling, knocking or “kettling” noises from the roof
Steam visible at vents or discharge points on very hot days
Likely causes:
Air trapped in the solar lines
Stagnation due to poor circulation
Incorrect pipe gradients or installation issues
Faulty non-return valves or tempering valves
Our Fix:
Bleed air from the system and restore continuous fall in pipework
Check and repair valves, fittings and flow direction
Verify collector/tank matching and overall system design
Make recommendations if the existing setup is contributing to recurring issues
Pinpointing noise issues early prevents major damage.
Why Gold Coast Locals Choose Todd’s for Rinnai Solar Repairs
Local & family-owned – 20+ years servicing Gold Coast homes
Rinnai solar specialists – experienced with Sunmaster, Prestige, split and close-coupled units
Fast, same-day hot water repairs – we prioritise no-hot-water calls
Up-front pricing – clear quotes before any work starts
5-star service – trusted by homeowners, strata managers and property managers
Service Areas
We service Rinnai solar hot water systems across the Gold Coast, including:
Southport • Labrador • Arundel • Helensvale • Coomera • Upper Coomera • Runaway Bay • Hope Island • Robina • Varsity Lakes • Burleigh Heads • Burleigh Waters • Nerang • Pacific Pines • Molendinar • Paradise Point and surrounding suburbs.
Why Choose Todd’s Plumbing & Electrical
✓ Family-owned Gold Coast business
✓ 20+ years specialising in solar hot water repairs
✓ Licensed plumbers & electricians (no subcontractors)
✓ Fast same-day service available
✓ 5-star local reviews & long-term customer relationships
✓ Experts in Solahart system diagnostics
When you call us, you speak directly with a local team—not an offshore call centre.
Call the Rinnai Solar Hot Water Experts
If your Rinnai solar hot water system isn’t performing, don’t wait for it to fail completely.
📞 Call Todd’s Plumbing & Electrical on 0482 080 423
Fast, friendly Rinnai solar hot water repairs across the Gold Coast.
FAQ – Rinnai Solar Hot Water
Q: Why is my Rinnai solar hot water not heating properly?
A: Common causes include a failed booster element or thermostat, a solar pump that isn’t circulating, airlocks or blockages in the solar loop, or faulty temperature sensors. A licensed plumber can test each component, bleed the system and restore correct boosting and circulation.
Q: How long does a Rinnai solar hot water system last?
A: Many Rinnai solar systems will last around 10–15 years or more with regular servicing, though coastal air, water quality and usage can shorten tank life. Visible rust, frequent leaks or ongoing faults are signs it may be time to repair or look at replacement options
Q: Can you repair leaks in Rinnai solar panels, or do they have to be replaced?
A: Leaks from fittings, valves or pipe joints are often repairable. If the panel casing is cracked, or frost/heat damage has split the absorber, replacement is usually the safest and most cost-effective option. We’ll always explain both repair and replacement choices before you commit.
Q: Do you service gas-boosted Rinnai solar systems?
A: Yes. We regularly work on Rinnai solar systems with continuous-flow gas boosters. We check both the solar side (collectors, pump, sensors) and the booster (power, gas, ignition and controllers) to make sure the whole system works together.
Q: How often should I service my Rinnai solar hot water system?
A: As a general rule, a check every 3–5 years is recommended – including valve checks, inspection of anodes (where applicable), assessment of collectors, and testing of sensors, controllers and pumps. Regular servicing reduces the risk of breakdowns and extends system life.
If it can't be fixed we can supply a new system from as little as $24 a week
Over 22 Years of 5-star Rated Service
Solar Hot Water Brands We Service & Repair
Aquamax
Apricus
Beasley
Bosch
Chromagen
Conergy
Dux
Ecosmart
Envirosun
Edwards
Everhot
Hills
Leda
Quantum
Midea
Neopower
Reece
Rheem
Rinnai
Sanden
Saxon
Stiebel Electron
Solahart
Solargain
Solar Oz Solar
Power Sun Ray
Sun Solar
Thermasun
Vulcan
Finance Available
Solar Hot Water Repairs Across The Gold Coast
Hot Water System Repairs & Replacement Experts
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Gast Hot Water
Roof Mounted
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Submit your details or call 0482 080 423
Head Office
1/28 central Park Avenue, Ashmore, Qld, 4214
0482 080 423
1300 609 606
QBCC: 1126780
Electrical License Number: 71053
We accept cash, direct deposits, and all major CC's