Hot Water System Installations, Repairs & Replacements

Stay Warm With Fast, Reliable Hot Water Plumbing – Servicing Sunbury & Surrounding Suburbs

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What Locals Are Saying About Our Plumbing Services

Hot Water Help When You Need It

A reliable hot water system is one of the most important features of any home. At MW Donnelly Plumbing, we specialise in hot water system installations, repairs, maintenance, and replacements across Sunbury, Gisborne, Craigieburn, Bacchus Marsh, and nearby suburbs.

Whether your current unit has failed or you’re upgrading to something more efficient, Mark and his team provide clear advice, fast service, and quality workmanship you can count on.

We work with all major brands and types, including electric, gas storage, instantaneous (continuous flow), heat pumps, and solar-ready systems.

Our Hot Water Services Include:

Hot water system repairs (all brands)
New system supply & installation
Emergency same-day replacements
Switching from electric to gas or vice versa
Heat pump and solar-compatible systems
Annual maintenance and temperature testing
Fault detection and diagnosis
Advice on system sizing and energy efficiency

Whether you’re dealing with no hot water, low pressure, fluctuating temperatures or visible leaking around the tank — we’ll diagnose it quickly and recommend the right fix.

Types of Systems We Service

We install and repair all major types of hot water systems, including:

Gas Storage Systems

Reliable and fast-heating, ideal for families with high hot water demand.

Electric Hot Water Systems

Affordable upfront and easy to install — we’ll help you choose an energy-efficient model.

Instantaneous (Continuous Flow) Systems

Compact and efficient — only heats water as you need it.

Heat Pump Systems

Use ambient air to heat water, saving energy and reducing running costs.

Solar-Compatible Systems

Future-ready solutions for homeowners looking to reduce their energy footprint.

Repair or Replace?

We’ll always try to repair a faulty system if it’s cost-effective — but in some cases, replacement is the smarter option. If your hot water unit is over 10 years old, showing signs of rust, or has had multiple breakdowns, we’ll walk you through modern, energy-saving alternatives.

Signs you may need a new system:

Rusty or discoloured water
Water leaking from the base
Unusual rumbling noises
Low or inconsistent water pressure
Hot water running out faster than normal
System is more than 8–10 years old

Servicing Sunbury and Beyond

If you’re without hot water, call us — we may be able to replace your system same day depending on availability.

How It Works

Step 1: Call or Send a Request

We’ll discuss your issue and system type and offer an initial assessment.

Step 2: On-Site Inspection (if needed)

We check your current system, your hot water usage, and the installation setup.

Step 3: Repair or Replace

We’ll repair the system or provide options and pricing for replacement.

Step 4: Installation & Cleanup

We install the new system, test everything, and remove the old unit.

Step 5: Ongoing Support

We offer maintenance reminders and support to ensure it runs smoothly for years to come.

Benefits

Same-day emergency service for hot water failures
Advice on best system size and type for your needs
Workmanship warranty on all new installations
All systems installed to Australian Standards
Fully licensed and insured technicians
Energy-efficient upgrade options available
Honest pricing – no hidden extras
Fast turnaround and respectful service

Clients who trust us

We’ve helped hundreds of locals regain their hot water quickly and affordably, including:

Sunbury homeowners dealing with ageing systems
Gisborne families needing higher-capacity storage
Craigieburn investors upgrading units in rentals
Diggers Rest residents switching to solar
Bacchus Marsh homes with failed electric units
Elderly homeowners who need dependable water heating
Builders and renovators looking for hot water rough-ins and fit-offs

Gallery

Frequently Asked Questions

What type of hot water system is best for my home?

It depends on your water usage, energy source, and budget. We’ll assess your needs and give you clear recommendations.

How long does it take to replace a hot water system?

Most replacements can be done in one day, often within a few hours.

What if my hot water stops at night or on the weekend?

We provide 24/7 emergency plumbing and can assist anytime.

Do you supply the system, or do I need to buy it myself?

We can supply, deliver, and install a system that suits your property. Or we can install a unit you’ve purchased.

Do you handle solar or heat pump hot water systems?

Yes. We install and maintain solar-ready and heat pump systems and can advise on rebates or energy efficiency.