Workmanship Guaranteed
Licensed & Insured
Upfront Fair Pricing
Finance Available
Thermann Solar Hot Water Repairs – Gold Coast to Brisbane
Fast, reliable repairs for Thermann solar hot water systems.
If your Thermann solar hot water system is running cold, the pump’s going all night, or the tank is leaking, you’re in the right place.
Thermann is a fast-growing Australian hot water brand with evacuated tube solar electric-boosted systems and gas/electric boosting options. These systems are efficient when they’re working properly – but like any solar hot water, they can develop faults in the collectors, pump, sensors, booster or valves over time.
At Todd’s Plumbing & Electrical, we diagnose and repair Thermann evacuated tube solar hot water systems all over the Gold Coast, restoring reliable, energy-efficient hot water for local homes.
📞 For fast Thermann solar repairs, call 0482 080 423
Thermann Solar Systems We Service
Thermann’s domestic solar range is typically marketed through Reece and includes:
Thermann Evacuated Tube Solar – Electric Boosted
Roof-mounted evacuated tubes feeding a manifold
Ground or wall-mounted storage tank with electric element for boosting
Electronic controller and circulation pump to move heat from the roof to the tank
Thermann Evacuated Tube Solar – Gas Boosted
Same evacuated tube collector and tank arrangement
Boosting via a continuous-flow gas unit that post-heats water if it isn’t hot enough
All Thermann solar systems use electric or gas boosting to maintain safe temperatures and kill Legionella, with specific minimum heat requirements depending on booster type. If you’re not sure which Thermann setup you have (e.g. “30 tube 315L electric boosted”), a quick photo of the tank label and roof collectors is usually enough for us to identify it.
Common Thermann Solar Hot Water Problems (and How We Fix Them)
This section is written to target real-world problems people search for and is structured for answer engines and People Also Ask.
1. Pump Running Constantly or At Night
Typical syptoms:
Pump noise or vibration all day
Pump running at night when it’s clearly not sunny
Likely causes (from Thermann’s own troubleshooting table):
Air lock in manifold or insufficient flow, causing the controller to keep the pump on
Freeze protection cycle, which can legitimately run the pump at night in cold conditions
Faulty non-return valve, causing unwanted circulation loops
What Todd's does:
Bleed air from the manifold and pipework to clear air locks
Check pump speed/flow and adjust or replace the pump if necessary
Inspect and replace faulty non-return valves
Improve collector line insulation if freeze protection is cycling too frequently at night
2. Pump Not Circulating Even in Sunny Weather
Symptoms:
Roof tubes hot to touch, but tank temperature remains low
Pump is silent, or controller LED shows a fault
Likely causes:
Maximum tank temperature already reached (normal – controller switches pump off)
Sensor issues (controller can’t see correct temperature difference)
Pump failure or wiring fault
Our fix:
Confirm whether tank has already reached set temperature (normal behaviour)
Test sensors and wiring; replace faulty sensors or repair connections
Test pump electrically and mechanically; replace if failed
Verify controller operation and reset if required
3. Water Not Hot Enough / Lukewarm Water
Thermann’s own manual lists several reasons why water might not be hot enough: booster not configured, high usage, tank sizing, or tempering valve issues.
Symptoms
Showers are only lukewarm, especially mornings or after cloudy days
Tank temperature never seems to reach a comfortable level
Likely causes:
Booster not configured correctly – thermostat below 60°C, booster turned off, or timer not set correctly
Household hot water usage exceeding system capacity
System undersized for the number of people
Tempering valve mixing water down below 50°C or needing service
What Todd's does:
Check and adjust booster thermostat (usually 60°C or above) and timer/off-peak settings
Review household usage vs tank size; recommend upgrades if undersized
Test and, if necessary, replace the tempering valve to restore correct outlet temperature
Ensure circulation and collectors are performing so solar contribution is maximised before boosting
4. Leaking Thermann Solar Tank, Valves or Tubes
Symptoms
General hot water and Thermann-specific troubleshooting guides highlight leaking tanks, valves and fittings as one of the most common issues.
Puddles around the storage tank
Constant drip from pipes or fittings
Visible corrosion, staining or damp sections around the unit
Likely causes:
Corrosion in the glass-lined storage tank over time (despite an internal anode)
Ageing relief valves, joints, unions and compression fittings
Evacuated tube or manifold damage if tubes have lost vacuum (turn milky instead of dark)
Our fixes:
Pressure-test tank and pipework to locate the source of the leak
Replace faulty PTR valve, fittings, unions or sections of pipe where repair is viable
Replace failed evacuated tubes or manifold components
If the tank is structurally compromised, provide repair-vs-replacement options (including modern solar or heat-pump units)
5. PTR Valve Dripping Constantly
Thermann manuals and general hot water guides emphasise regular PTR valve checks and replacement as key maintenance
Symptoms:
Continuous trickle from PTR drain line
Regular hot water discharge even when system isn’t heating
Likely Causes:
Normal expansion discharge (small, occasional discharge is normal)
Debris or scale lodged in the valve seat
Faulty PTR valve or excessive mains pressure
Our fix:
Test mains and system pressure
Exercise the PTR lever to clear debris; if not resolved, replace valve
Install or confirm a pressure-limiting valve on inlet if required
Check thermostat/booster settings to ensure water is not overheating
6. No Hot Water at All
Thermann troubleshooting guides for all their systems (electric, solar, heat pump) list no hot water as a top complaint, usually tied to power, thermostat, elements or major faults.
Likely Causes:
Tripped circuit breaker or blown fuse
Faulty heating element or thermostat
Controller or pump failures preventing any solar contribution AND booster heating
In rare cases, product recall issues – for example, some THP45 heat pump units sold between Oct 2021 and Sept 2024 have a recall related to electrical safety if the cover is removed
What Todd's does:
Check and reset breakers and isolators; verify power supply
Test the element and thermostat with appropriate equipment; replace if faulty
Diagnose controller, sensors and pump to restore solar function
Check model/serial against any published recalls and advise on next steps if relevant
7. Noisy Thermann Solar Hot Water System
Some Thermann troubleshooting guides note noisy tanks and systems due to sediment build-up or air in the system.
Symptoms:
Banging, gurgling or “kettling” sounds from tank or pipework
Occasional popping or rumbling during heating cycles
Likely Causes:
Sediment build-up on the bottom of the tank
Air pockets in the solar loop
Flow restrictions or faulty valves causing sudden changes in pressure
Our fix:
Drain and flush the tank where appropriate
Bleed the solar circuit to remove trapped air
Check valves for correct operation; replace faulty components
Inspect anode and internal condition as part of a wider service
Why Gold Coast Locals Choose Todd’s for Thermann Solar Repairs
Local & family-owned – 20+ years working with hot water systems in coastal QLD
Experience with Thermann evacuated tube solar, electric and gas boosting
Fast, same-day service for no-hot-water emergencies
Up-front pricing with clear explanations before work starts
Advice on repair vs replacement, tailored to Gold Coast climate and water conditions
Service Areas
We repair Thermann 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 Thermann Solar Hot Water Experts
If your Thermann solar hot water system isn’t performing, don’t put up with cold or unreliable hot water.
📞 Call Todd’s Plumbing & Electrical on 0482 080 423
Same-day Thermann solar hot water repairs across the Gold Coast, with honest advice on the best long-term solution for your home.
FAQ – Thermann Solar Hot Water
Q: Why is my Thermann solar pump running all night?
A: Thermann manuals note that the pump can run at night for freeze protection, which is normal. However, if it’s running very frequently, it may indicate poor pipe insulation or a faulty non-return valve, and a plumber should investigate.
Q: Why isn’t my Thermann solar hot water hot enough?
A: Common reasons include the booster not being configured correctly (thermostat below 60°C, off-peak not active), high household usage, an undersized tank, or a tempering valve mixing water down to 50°C. Sensor or circulation issues can also reduce solar contribution
Q: Can you repair leaks on a Thermann solar system, or do I need a new unit?
A: Leaks from valves, joints or individual tubes are often repairable. If the tank itself is rusted through or multiple tubes/manifold sections have failed, replacement may be more economical and reliable long-term. We’ll always explain your repair vs replacement options clearly before you choose.
Q: Do Thermann solar systems still work on cloudy days?
A: Yes — evacuated tubes are designed to harvest diffuse light efficiently, but output is reduced on very cloudy days. That’s why Thermann systems include electric or gas boosting to ensure you still reach safe temperatures and have reliable hot water year-round.
Q: How long does a Thermann evacuated tube solar hot water system last?
A: Thermann’s owner manual indicates long warranties on tanks and collector manifolds (for example, 10 years on tank and 15 years on manifold/tubes on some models), and with proper maintenance many systems can last 10–15+ years. Regular checks on the anode, PTR valve and tubes help maximise lifespan.
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
Electric Hot Water
Heat Pumps
Gast Hot Water
Roof Mounted
Solar Hot Water
Split System
Solar Hot Water
Solar Power
Systems
Get A Free Quote
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