Hot Water Systems Explained – Electric, Gas, Solar, and Heat Pump

Hot Water

3 minutes

26 Sept 2025

Written by Jake Deppeler — Plumber & Founder of Trust Trade

Introduction

Choosing the right hot water system is one of the most important decisions for your home. Each type has pros and cons, and what works best depends on your household size, budget, and energy goals.

How It Works

The four main types of systems are:

  1. Electric Storage – Heats water with an electric element inside a tank.

  2. Gas Storage/Instant – Uses gas burners to heat water in a tank or instantly on demand.

  3. Solar Hot Water – Roof panels collect solar energy, often with a booster for cloudy days.

  4. Heat Pump – Works like a reverse air conditioner, transferring heat from the air into water.

Key Benefits of Understanding Your Options

Here’s a side-by-side look at the pros and cons of each system:

1. Electric Hot Water

Pros:

  • Cheapest upfront cost

  • Easy to install almost anywhere

  • Widely available replacement parts

Cons:

  • Highest running costs (especially with peak electricity rates)

  • Not energy-efficient

  • Usually no rebates or incentives


2. Gas Hot Water

Pros:

  • Reliable supply (good for larger families)

  • Instant systems provide endless hot water on demand

  • Cheaper to run than standard electric systems

Cons:

  • Gas prices are rising steadily

  • Requires gas connection to property

  • Higher carbon emissions than other options


3. Solar Hot Water

Pros:

  • Very low running costs once installed

  • Environmentally friendly (uses renewable energy)

  • Often eligible for generous rebates

Cons:

  • High upfront cost (especially with large storage tanks)

  • Needs roof space with good sun exposure

  • May require an electric or gas booster in cloudy/rainy periods


4. Heat Pump Hot Water

Pros:

  • Uses up to 70% less energy than electric storage

  • Works day and night, even in cooler weather

  • Eligible for rebates in most states

  • Good option if paired with solar power

Cons:

  • Higher upfront cost than electric or gas

  • Needs outdoor space with airflow

  • Can be noisier than other systems if installed too close to living areas

What to Watch Out For

Cheap upfront, costly long-term – Electric systems are cheap to buy but expensive to run.

  • Choosing only on upfront price — cheap now can mean expensive bills later.

  • Not considering your household size — too small a system means running out of hot water, too big means wasted energy.

  • Ignoring rebates — many homeowners miss out on thousands in savings.

What to Do Next

Compare your current bills, household size, and future plans. Then use Trust Trade to connect with licensed plumberswho can recommend the best system and install it correctly.

Hot Water Systems Explained – Electric, Gas, Solar, and Heat Pump

Hot Water Systems Explained – Electric, Gas, Solar, and Heat Pump

Hot Water Systems Explained – Electric, Gas, Solar, and Heat Pump

Compare hot water systems in Australia. Learn the pros and cons of electric, gas, solar, and heat pump units to find the best fit for your home.

Compare hot water systems in Australia. Learn the pros and cons of electric, gas, solar, and heat pump units to find the best fit for your home.

Compare hot water systems in Australia. Learn the pros and cons of electric, gas, solar, and heat pump units to find the best fit for your home.

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Check out our Privacy Policy for more information.

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