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Solahart Repairs Specialists – Gold Coast & Brisbane
Fast, reliable repairs for Solahart roof-mounted and split solar systems.
Solahart systems are known for their longevity, but when they stop heating properly, start leaking, or trip your power, you need someone who knows the brand inside out. Todd’s Plumbing & Electrical has been repairing Solahart solar hot water systems across the Gold Coast for more than 20 years. We're a family-owned local business with a team of licensed plumbers and electricians who handle every part of the repair—roof, tank, pump, valves, sensors, and electrical components.
Whether your system is struggling to heat water, losing pressure, or showing signs of wear from age, we’ll diagnose the issue quickly and get it back performing efficiently.
Same day service at no extra cost (conditions apply)
Common Solahart Problems We Repair
Solahart systems have very specific failure points. Below are the most common issues Gold Coast homeowners experience—and the solutions we provide. At Todd's Plumbing Brisbane, we've repaired hundreds of Solahart systems across all models—from the classic roof-mounted L Series and J Series to modern Streamline split systems. We stock genuine Solahart parts and can diagnose problems quickly. Whether your system is 5 years old or 25 years old, we can help. Call us today for fast, professional Solahart solar hot water repairs in Brisbane.
Lukewarm or No Hot Water
Likely causes:
Failed solar sensor or thermostat
Element or booster not heating
Pump failure (split systems)
Cloudy weather combined with a bad booster relay
Scale build-up on the element
How we fix it:
We test the sensors, thermostat, element, booster, and wiring. We also check the solar absorption on the roof panels to ensure they’re transferring heat correctly.
Leaking Roof Panels or Tank
Likely causes:
Corrosion in the tank
Cracked or damaged solar collectors
Faulty pipework or loose compression fittings
Weather damage from storms or hail
How we fix it:
We isolate the leak, pressure-test the lines, repair or replace damaged components, and check for heat-related expansion issues that often appear in older Solahart systems.
Booster Not Kicking In
Likely causes:
Faulty booster element
Burnt-out thermostats
Wiring or relay failure
Off-peak tariff timing issues
How we fix it:
We test electrical continuity, verify tariff configuration, replace the element if required, and reset the system so it reliably heats when solar isn’t enough.
Temperature Pressure Relief (TPR) Valve Constantly Dripping
That annoying drip-drip-drip from your TPR valve isn't just wasting water—it's costing you money and signaling system problems. Understanding TPR Valves: These safety valves (also called PT valves or HT55 valves) are designed to release water if temperature exceeds 99°C OR pressure exceeds 1000kPa. They're mandatory on unvented Solahart systems and must be replaced every 5 years regardless of condition.
Why TPR valves constantly dripping
System overheating during summer—collectors getting too hot
Scale buildup preventing valve from seating properly
Valve degraded from UV exposure (incorrect installation)
Valve opened manually (for testing) and debris caught in seat
Tank overpressurized from thermal expansion
Valve exceeded 5-year service life and failing
Glycol leak pressurizing system (closed circuit models)
Symptoms you'll notice
Constant dripping from relief pipe (especially afternoon/evening)
Water pooling below drip point or down into garden
High water bills from continuous loss
Relief pipe discharges scalding hot water
Gurgling sounds from valve before discharge
Gold Coast & Brisbane Summer Problem: On 35°C+ summer days with full sun, Solahart collectors can superheat water to 80-90°C. If hot water isn't being used (e.g., family away on holiday), the TPR valve releases pressure multiple times per day. This is NORMAL—but if it happens constantly even with regular use, the system has issues.
Brisbane and Gold Coast Summer Problem: On 35°C+ summer days with full sun, Solahart collectors can superheat water to 80-90°C. If hot water isn't being used (e.g., family away on holiday), the TPR valve releases pressure multiple times per day. This is NORMAL—but if it happens constantly even with regular use, the system has issues.
Repair Solution: We replace degraded TPR valves with genuine Solahart parts (RMC or equivalent 1000kPa/99°C units), test for over-pressurization causes, install TRV (over-temperature relief) tanks if needed, and adjust system to prevent summer overheating. TPR valve replacement takes 30 minutes and costs $180-$300 installed.
Water Loss Reality: A constantly dripping TPR valve can waste 20-50 liters per day—that's 7,000-18,000 liters per year or $50-$150 in extra water costs. Fix it promptly.
System Not Heating Despite Sunny Weather
Likely causes:
Shaded roof panels
Air lock in the solar circuit
Pipe insulation failures
Collector sensor failure
How we fix it:
We check solar absorption, remove air locks, reinsulate lines, test collectors, and restore proper flow so the roof panels can effectively heat the water.
Circulation Pump Failure (Streamline Split Systems)
Solahart Streamline split systems rely on circulation pumps (also called circulators) to move water between ground-level tanks and rooftop collectors. When these fail, your expensive solar system becomes an expensive electric water heater.
Common Pump Brands in Solahart Systems::
Salmson pumps (most common—especially in systems pre-2015)
Grundfos circulators (newer installations)
Wilo circulators (alternative brand)
Why Circulation Pumps Fail:
Scale buildup clogging impeller (Brisbane hard water areas)
Impeller vanes damaged or corroded
Pump seized from lack of use or debris accumulation
Internal aluminum housing corroded through (Salmson pumps especially)
Controller not activating pump—pump is actually fine
Electrical wiring corrosion preventing power delivery
Air lock preventing pump from priming
Symptoms you'll notice:
Booster running constantly but collectors not heating
Pump completely silent (should hum when active)
Pump vibrating loudly but no water movement
Hot water only when electric boost is on
Panels cold in full sun—water not circulating
High electricity bills from constant boosting
The Detection Test: On a sunny day, touch the pipes at the tank. The hot pipe from collectors should be warm. If both pipes are cold, the pump isn't circulating water. If the pump is humming but pipes are cold, it's seized or clogged.
Brisbane's Scale Problem: Western Brisbane suburbs (Ipswich, Forest Lake, Springfield) have higher water hardness. Scale buildup in circulation pumps occurs faster here—expect 7-10 year pump life instead of 10-15 years in eastern suburbs.
Repair Solution: We remove the circulation pump, inspect for scale/debris, clean if possible, or replace with genuine parts. Salmson pump replacements cost $350-$500 from dealers (we source aftermarket for $185-$250). We also descale pipework if needed and test controller operation.
DIY Warning: Removing circulation pumps requires draining the system and dealing with hot water under pressure. Many homeowners damage impeller vanes trying to clean pumps themselves. Professional pump service costs $250-$400—much less than buying a new pump after DIY failure.
Leaking Solar Collectors & Cracked Glass Panels
Brisbane homeowners frequently experience leaking Solahart collectors, particularly on L Series and J Series roof-mounted systems. The issue typically manifests as water running down the roof, pooling in gutters, or dripping from panel connections.
Common causes:
Frost damage from rare cold Brisbane nights (below 5°C) - warranty doesn't cover this
Cracked collector glass from hail, falling branches, or thermal stress
Failed O-rings at collector connections - these deteriorate after 10-15 years
Cone seal leaks on closed circuit KF/J Series systems (common design flaw)
Glycol leaks from internal copper pipes (closed circuit systems only)
Over-pressurization during summer overheating episodes
Symptoms you'll notice:
Water running down roof from panels (especially morning after cold night)
Blue-tinted water from taps (indicates glycol leak mixing with drinking water)
Loud banging/knocking noises from panels during hot weather
Puddles forming on roof near collectors
System performing poorly despite sunny weather
Sacrificial Anode Depletion & Premature Tank Rust
Solahart's biggest tank killer is anode neglect. The sacrificial magnesium anode rod protects your vitreous enamel-lined tank from corrosion—but it only lasts 5 years. When ignored, tanks rust from the inside out.
The Anode Trap: Solahart recommends 5-year anode replacement, but doesn't include it in warranty coverage. Many Brisbane homeowners don't even know their system has an anode until the tank starts leaking. By then, it's too late—tank replacement costs $2,000-$4,000.
Common scenarios leading to tank failure:
System installed 10+ years ago, anode never replaced (most common scenario)
Hard water areas (western Brisbane) accelerate anode depletion to 3-4 years
System serviced but anode skipped to save $150—false economy
Previous owner never serviced system, new homeowner inherits damaged tank
Softened or desalinated water causing rapid anode deterioration
Symptoms you'll notice:
Rusty discolored hot water (especially first thing in morning)
Small leak appearing near tank base or end flange
Reduced hot water output despite sunny weather
Metallic taste or smell in hot water
Visible rust staining on tank exterior
Brisbane Water Quality Factor: Brisbane's water is generally good quality (TDS 200-400 mg/L), but areas with bore water supplements or older infrastructure have higher mineral content. These areas need 3-year anode inspection instead of standard 5-year service.
Repair Solution: We drain the tank, remove the access panel, and extract the depleted anode. If the tank is still sound, we install a new magnesium anode (1510mm for most Solahart models). If internal corrosion has already begun, we assess whether tank replacement is necessary. Catch it early and you save thousands.
Cost Reality: 5-year service including anode replacement: $400-$600. New tank replacement: $2,000-$4,000+. The choice is obvious—preventative maintenance saves money.
Thermostat Failure & Incorrect Temperature Settings
Solahart thermostats are notorious for causing frustration. The most common complaint: "I'm paying for electric boosting but still getting lukewarm water."
The 50°C Installation Trap: Many Brisbane Solahart dealers install thermostats set to 50°C by default—supposedly for "safety." This is NOT hot enough for most households. You'll find yourself running the tap on hot-only just to get a warm shower, especially in winter.
Common thermostat problems:
Factory preset to 50°C—too low for Brisbane winters
Thermostat reading incorrectly (stuck at 70°C when water is actually 40°C)
ECO (safety cutout) tripped at 83°C and won't reset
Thermostat contacts worn out—element never turns on
Wiring corroded at thermostat terminals
Thermostat probe fallen off tank surface—giving false readings
Symptoms you'll notice:
Electric booster runs constantly but water stays tepid
Hot water fine in summer, inadequate in winter
Need to use hot tap 100% to get warm shower
Water temperature drops quickly after one shower
Power bills high but water not hot
The 60°C Solution: Thermostats should be set to 60°C minimum for comfortable showers—or up to 70°C maximum for larger households. This gives you the mixing ratio needed (hot + cold = comfortable shower) rather than running pure "hot" water that's barely warm.
Brisbane Winter Reality: On a Brisbane winter day (22°C max), solar collectors will heat water to about 40-45°C from 20°C cold water. WITHOUT proper thermostat boost to 60°C, you won't have hot water. Solar alone is insufficient 4-5 months per year.
Repair Solution: We test thermostat calibration, adjust settings to 60°C, replace faulty thermostats (Robertshaw 50-70°C models for Solahart), reset tripped ECO switches, and ensure secure probe contact. Many "booster not working" issues are simply thermostat settings too low.
Professional Installation Note: Reputable plumbers set thermostats to 60°C. Cowboys set them to 50°C to avoid callback complaints about "water too hot." If your installer resisted raising the temperature, that's a red flag.
Why Solahart Systems Need a Specialist
Solahart units use unique components, layouts, and roof-mounted configurations. Incorrect repairs can void warranties or create dangerous pressure issues. We work on:
Solahart Kf, L, 300L, 302L & 181L roof-mounted systems
Solahart split systems (roof panels + ground tank)
Electric boosters, gas boosters & hybrid setups
Every job includes a full system health check so you know exactly what needs attention now—and what may need maintenance soon.
Your Local Gold Coast & Brisbane Solar Hot Water Repair Experts
With more than two decades on the Gold Coast & Brisbane, we understand how local weather affects solar hot water:
Coastal corrosion
Storm-related roof damage
Hard-water scale build-up
High-UV exposure on solar collectors
Todd’s Plumbing & Electrical delivers repairs that last, with transparent pricing and no pushy sales.
How Our Repair Process Works
1. Initial Diagnostic
We check the roof panels, tank, sensors, valves, wiring, insulation, and booster performance.
2. Clear, Fixed Pricing
You’ll know the repair cost before we start.
3. Fast On-Site Repair
We carry common Solahart parts in our vehicles, allowing most repairs to be completed same day.
4. System Performance Check
We test thermostat settings, pressure levels, and booster operation to ensure everything is safe and efficient.
5. Ongoing Support
If your unit is nearing end-of-life, we’ll give honest advice—not sales pressure.
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 Now for Solahart Solar Hot Water Repairs
📞 0482 080 423
Prompt, reliable repairs anywhere across the Gold Coast.
Frequently Asked Questions
Why is my Solahart system not heating water?
The most common reasons include sensor faults, a failed booster, circulation issues, or heat loss through damaged insulation. A technician should test the sensors, thermostat, wiring, element, and collector performance.
How long do Solahart solar hot water systems last?
Most Solahart units last 10–20 years depending on maintenance, water quality, and roof exposure. Regular servicing can significantly extend lifespan.
What is the average cost to repair a Solahart system?
Minor fixes such as replacing valves or sensors can be inexpensive, while major repairs like tank replacements or collector repairs cost more. We provide fixed pricing after inspection.
Do Solahart systems need yearly servicing?
Yes. Annual servicing helps prevent leaks, boosts efficiency, and catches small issues before they become costly repairs.
Can you repair Solahart collectors after storms?
Absolutely. We handle storm-damaged panels, broken glass, hail impact, and roof plumbing issues..
Do you also install new solar hot water systems?
Yes. If your old system has reached the end of its life, we can recommend, supply, and install a new solar hot water system tailored to your household needs.
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
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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