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:
Electric Storage – Heats water with an electric element inside a tank.
Gas Storage/Instant – Uses gas burners to heat water in a tank or instantly on demand.
Solar Hot Water – Roof panels collect solar energy, often with a booster for cloudy days.
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.