Choosing a Hot Water System
Start with the decisions that actually matter: household demand, system type, tank size, recovery, energy use, space, solar and replacement compatibility. Use the quick finder or jump into a detailed buying guide.
Answer three questions and we’ll point you to the most useful guide or product range.
Make the Big Decisions First
Most hot water buying mistakes happen before brand or model even enters the conversation. The important first decisions are how much hot water the household actually uses, whether the system can recover quickly enough, which energy source suits the property and whether the new unit fits the existing installation.
This hub brings those decisions together. Start with sizing if you are unsure of capacity, compare technologies if you are changing system type, then move into the detailed electric or heat pump guides when you know which direction suits the property.
Skip the guides and browse the current HWO range by technology. Product pages show current pricing, stock and available delivery options.
Core Buying Guides
These are the broadest decision pages and should answer most questions before you get into model-specific detail.
What Size Hot Water System Do I Need?
Estimate a practical starting capacity using household size, usage level, showers, baths and system type.
Use the sizing guide → Technology ComparisonElectric vs Heat Pump Hot Water
Compare upfront simplicity, running energy, rooftop solar, noise, airflow and replacement requirements.
Compare technologies → Capacity Comparison250L vs 315L Hot Water System
Compare two of the most common family storage sizes by demand, heating window, recovery and reserve capacity.
Compare 250L and 315L → Household GuideBest Hot Water System for a Family of 4
See how electric, heat pump and gas options compare for a typical four-person household.
View family-of-4 guide → Tank ConstructionStainless Steel vs Vitreous Enamel
Understand tank material, corrosion protection, anodes, water-quality limits and maintenance differences.
Compare tank materials → Replacement PlanningHow Long Do Hot Water Systems Last?
Work out whether an older system is worth keeping, repairing or planning to replace before it fails.
Check lifespan guidance →Choose in the Right Order
Starting with brand or price can send you toward the wrong product. Work through the decision in this order instead.
Estimate daily use and peak demand before choosing a tank capacity or flow rate.
Compare electric, heat pump and gas against the property, budget and energy priorities.
Confirm dimensions, electrical supply, gas availability, airflow, drainage and connection positions.
Once the category is right, compare brand, warranty, features, stock, delivery and current price.
Hot Water System Types
Use the buying guides first if you are unsure. If you already know the system type, jump directly into the current range.
Simple, widely available storage systems across compact and family capacities, with multiple element and tank options.
Shop electric hot water →High-efficiency stored hot water using ambient heat, with plug-in and hardwired configurations across multiple sizes.
Shop heat pumps →Continuous-flow systems sized primarily around simultaneous flow demand rather than storage volume.
Shop instant gas →Stored gas hot water with tank capacity and burner recovery both influencing household performance.
Shop gas storage →Use the HWO running-cost calculator with your own electricity and gas rates rather than relying on a generic national estimate.
Already Narrowed It Down?
These child guides answer more specific questions once you know which technology you are considering.
1.8kW vs 2.4kW vs 3.6kW Electric Hot Water
Compare element input, approximate current draw, recovery time and controlled-load implications.
Compare electric elements → Heat Pump GuideWhat Size Heat Pump Hot Water System Do I Need?
Size a heat pump around storage, recovery, winter conditions, peak demand and heating window.
Use heat pump sizing tool → Heat Pump GuidePlug-In vs Hardwired Heat Pump
Compare electrical connection methods, solar-control flexibility and replacement considerations.
Compare connection types →Common Hot Water Buying Questions
Quick answers to the questions that normally come before selecting a particular brand or model.
