Hot Water System Repairs & Replacement — Same-Day Service

When Your Hot Water Fails, You Need It Fixed Today

Few things disrupt your household routine like losing hot water. Cold showers, no washing up, no laundry — and if you are running a cafe or restaurant in Bondi Junction or Surry Hills, no hot water means no trade. Mr Plumber provides same-day hot water repairs and replacement across Sydney’s Eastern Suburbs so you are never without hot water for long.

Our vans carry a full inventory of common replacement parts — thermostats, elements, pilot assemblies, temperature and pressure relief valves, anode rods and tempering valves — so the majority of repairs are completed in a single visit. For system replacements, we stock popular Rheem, Rinnai and Dux units on our vehicles and can have a new system installed and running within hours.

Types of Hot Water Systems We Service

Gas Storage Systems

Gas storage hot water systems remain the most common type in Eastern Suburbs homes. Brands like Rheem Stellar, Rinnai Hotflo and Dux Prodigy use a gas burner to heat water stored in an insulated tank. Common issues include failed thermocouples, blocked burner orifices, leaking tanks and faulty temperature and pressure (TP) relief valves.

Our plumbers carry replacement parts for all major gas storage brands and can typically complete a repair within an hour. If your tank is leaking — a sign that the internal lining has corroded — we can install a replacement unit the same day.

Continuous Flow (Tankless) Systems

Continuous flow systems from Rinnai, Bosch and Rheem heat water on demand as it passes through a heat exchanger. They are popular in apartments across Bondi, Darlinghurst and Potts Point where space is limited. Common faults include ignition failures, error codes, scale build-up in the heat exchanger and fluctuating water temperatures.

We service and install all continuous flow brands and can flush scale from heat exchangers to restore performance without requiring a full replacement.

Electric Storage Systems

Electric hot water systems use one or two immersion elements to heat water in a storage tank. They are common in older units and apartments where gas is not available. Typical failures include burnt-out elements, failed thermostats, leaking TP valves and corroded tanks.

If your electric system has failed and you are considering a replacement, we often recommend upgrading to a heat pump — which uses 60-70% less electricity than a traditional electric storage system.

Heat Pump Systems

Heat pump hot water systems extract heat from the ambient air and use it to heat water — much like a reverse-cycle air conditioner. They are the most energy-efficient option available and are well suited to the mild Eastern Suburbs climate. We install and service heat pump units from Reclaim, Sanden, Rheem and iStore.

NSW government rebates of up to $1,000 are currently available for replacing an electric storage system with an eligible heat pump, making the switch more affordable than ever.

Solar Hot Water

Solar hot water systems use roof-mounted panels to pre-heat water before it enters a gas or electric booster. We service all solar systems, including Solahart, Rheem and Chromagen. Common issues include failed circulating pumps, leaking collector panels and faulty booster elements.

Common Hot Water Problems and Their Causes

No Hot Water at All

If your system is producing no hot water, the most likely causes are a failed thermostat, tripped circuit breaker (electric), extinguished pilot light (gas) or a faulty gas valve. Our plumber tests each component systematically to pinpoint the fault.

Not Enough Hot Water

Running out of hot water faster than usual often indicates sediment build-up in the tank, a partially failed element (electric) or an undersized system for your household. We can flush the tank to remove sediment or advise on upgrading to a larger capacity unit.

Water Too Hot or Not Hot Enough

Inconsistent temperatures typically point to a faulty thermostat or a failed tempering valve. Under AS 3498, all new hot water installations must include a tempering valve that limits delivery temperature to 50 degrees Celsius at bathroom fixtures to prevent scalding. If your system was installed before this requirement, we strongly recommend adding a tempering valve.

Leaking Tank

A leaking tank is usually terminal — it means the glass or enamel lining inside the tank has cracked, allowing the steel shell to corrode. While we can replace TP valves and inlet/outlet connections, a leaking tank body requires full replacement.

Strange Noises

Banging, popping or rumbling sounds from a hot water tank are caused by sediment build-up on the element or burner. Flushing the tank resolves this in most cases. If the noises persist, the element or anode rod may need replacement.

Choosing the Right Replacement System

When replacement is the best option, we help you choose the right system based on your household size, available energy sources and budget. For a full pricing breakdown, see our guide on hot water system replacement costs in Sydney. Here is a general guide:

We take the time to explain the pros and cons of each option — our guide comparing electric vs gas vs heat pump hot water systems can help you weigh the differences before your appointment. There is no pressure to choose the most expensive system — we want you to be happy with your choice for years to come.

Compliance and Safety

All Mr Plumber hot water installations comply with AS/NZS 3500 (plumbing), AS/NZS 5601 (gas) and AS 3498 (tempering valves). We provide compliance certificates for every gas installation and ensure all work meets NSW Fair Trading requirements.

Call 1800 247 474 for same-day hot water repairs or a free replacement quote.