Choosing a hot water system is more than just a checkbox—it’s about comfort, efficiency and value for your home.
With so many choices on the market today, it can be a daunting task to decide which direction to head in.
Not to worry—we’ve highlighted the crucial factors to choose the best hot water system so you can get the system best suited to your family’s needs.
1. Get familiar with the main types of hot water systems
Before you get into comparing models and prices, it’s important to understand what options you have to choose from. In Australia, the commonly available types of hot water systems include:
a. Storage Tank Systems
The systems heat and store a quantity of water in a tank. When the water has heated, it is stored in insulation for any future use. When it runs out of hot water, you must wait for it to heat again.
Best for: Larger households that want to use a lot of hot water at the same time (multiple showers, washing dishes, laundry).
b. Instant (Tankless) Systems
This only heats water on demand, so you never ‘run out’ of hot water, technically speaking.
Best for: Smaller households, those that want to save on space, and lower running costs.
c. What are Combi Boilers?
Combi boilers have become the most popular choice in UK homes as they provide both central heating and hot water all in one package.
Best for: Small to medium homes with little/ no space for a hot water cylinder.
d. Solar Hot Water
Solar hot water systems will usually have solar panels, more often than not fitted on the roof of your property, and they preheat the water. The preheated water is delivered directly to your hot water tap, so, if the water is hot enough, kettle or gas does not need to be used.
Best for: Homes concerned about environmental impact and have a good amount of roof space for solar panels and sunlight.
2. Think About The Size of Your Household and How Much Hot Water You Use
One of the biggest mistakes that households make is assuming their hot water consumption, and often these estimates are too low. Ask yourself the following questions:
- How many people live in the household?
- Do you use more than one hot water outlet at the same time (e.g. shower + washing up)?
- How long are your showers, on average?
- Do you use a dishwasher or washing machine on a daily basis?
As a general guideline:
- 1-2 people: Instant or small storage (30-50 litres)
- 3-4 people: Medium (125-250 litres)
- 5+ people: Large storage (250 litres or more)
3. Examine Your Energy Source
The type of energy source used for your hot water system will impact your running costs and efficiency. In the UK, your options typically include:
Gas: Generally less expensive than electricity and suitable for high-demand homes.
Electric: Generally easier to install, however will be more expensive to run in the long term.
Solar: Low running costs, however higher capital cost.
Oil or LPG: Often used in rural areas without mains gas.
Tip: If you are using gas for heating or cooking, typically a gas system will be more suited for cost effectiveness.
4. Assess Energy Efficiency and Running Costs
While your upfront cost is important, running costs can quickly add up over the years, so always check the energy efficiency rating of the system before you buy. The more energy efficient the system, the lower your bills will be.
Examine models for:
- Good insulation (for storage systems)
- Smart timers or thermostats
- Integration for renewable energy (solar ready)
Bonus: An energy efficient system also decreases your household carbon footprint.
5. Account For Space and Installation
Do you have enough space for a tank? Would a wall hung unit be better for your flat? Combi (combination) boilers tend to be compact and well suited for small residences, where a family may require a full sized tank in an airing cupboard or loft.
- It is also important to verify:
- Water pressure (in the case of combi boilers)
- Access to the gas mains
- Compatibility with existing plumbing
A qualified installer can view your house and suggest what works with your needs and your home layout.
6. Consider long-term reliability and warranty
A hot water system constitutes a long-term investment. You should prioritise brands known for reliability and good after-sales service. Look for:
- A solid warranty (ideally 5–10 years)
- Accessibility to replacement parts
- Local customer service and approved service providers
7. Add in installation and maintenance costs
Always cost out the full installation expense, which may include:
- Decommissioning your old system
- Modifications to your pipework
- Plastering or finishing work
- Certifications for safety
Insist on receiving a full quote from a plumber or heating engineer at the outset.
Also include maintenance as an ongoing expense, as instantaneous systems will generally require less in maintenance than storage systems, which may require an annual service or flushing.
The Bottom Line for Choosing the Best Hot Water System
Choosing the best hot water system isn’t a one-size-fits-all situation. It will depend on your family size, budget, energy supply and hot water allocation through your day.
Taking some time at the start to plan and seek advice from a licensed professional could save you anguish down the track—and a few cold showers.
Are you still not sure what hot water system is best for your family? Speak to a local plumbing and heating expert for a tailored recommendation.
