Best Hot Water System for a Family of 5 or More

Jun 5, 2026

Choosing the best hot water system for a family of 5 or more depends on household size, number of bathrooms, shower habits, bath use, laundry demand, kitchen use, energy source and the system already installed. Larger households usually need stronger hot water performance than smaller homes, so tank size, recovery rate and flow rate become much more important.

At Hot Water Outlet, you can compare hot water systems online, including electric hot water systems, heat pump hot water systems, gas hot water systems, instant gas hot water systems, instant electric hot water systems and common valves, pipework and fittings.

Quick Answer: What Is the Best Hot Water System for a Family of 5 or More?

The best hot water system for a family of 5 or more is usually a larger storage system, a correctly sized heat pump, a gas storage unit with suitable recovery, or a higher-flow instant gas hot water system where natural gas or LPG is available.

As a general guide:

Choose a larger electric hot water system if the home already uses electric storage and a straightforward tank-style replacement is preferred.
Choose a larger heat pump hot water system if you want an efficient electric storage option and the property has suitable outdoor space, airflow and location conditions.
Choose a gas hot water system if the home already uses natural gas or LPG and a traditional gas storage replacement suits the property.
Choose a higher-flow instant gas hot water system if the home has natural gas or LPG and the household wants continuous flow hot water.
Choose an instant electric hot water system only for suitable point-of-use applications where the product and electrical requirements match the intended use.

For most larger families, the best starting point is to check whether the current system runs out of hot water. If it does, compare larger capacity, stronger recovery or a higher-flow system before ordering.

Why Larger Families Need More Careful Hot Water Sizing

A family of 5 or more can place heavy demand on a hot water system. Multiple showers, baths, laundry loads, kitchen use and cleaning can all happen in the same morning or evening period.

Larger households may use hot water for:

Back-to-back showers
Two bathrooms running close together
Children’s baths
Teenagers taking longer showers
Morning and evening peak use
Kitchen sink use
Dishwasher use where connected to hot water
Washing machine use where connected to hot water
Laundry cleaning
Multiple outlets being used at the same time

This is why larger families should not choose a hot water system by price alone. A smaller unit may look cheaper upfront, but it may not keep up with daily demand.

Hot Water System Options for a Family of 5 or More

System Type	Good For	Main Benefit	Main Thing to Check
Larger electric storage	Homes already using electric hot water	Familiar tank-style replacement	Tank capacity, recovery rate and dimensions
Larger heat pump	Efficient electric storage for suitable homes	Energy-efficient electric option	Outdoor space, airflow, noise rating and tank size
Gas storage	Homes already using gas storage	Traditional stored gas hot water	Natural gas or LPG, tank size and recovery
Higher-flow instant gas	Homes with gas wanting continuous flow	No large storage tank	Flow rate in L/min and gas type
Instant electric	Specific point-of-use applications	Compact local hot water where suitable	Electrical requirements and intended use

A larger family can suit several system types. The best choice depends on the current energy source, available space, number of bathrooms and how the household uses hot water.

What Size Hot Water System Does a Family of 5 or More Need?

For a family of 5 or more, sizing is one of the most important decisions.

Storage systems are measured by tank capacity in litres. This includes electric storage, gas storage and heat pump hot water systems.

Instant gas systems are measured by flow rate in L/min. They heat water as it passes through the unit instead of storing it in a large tank.

When choosing a hot water system for a larger household, consider:

Number of people in the home
Number of bathrooms
Number of showers per day
Whether showers happen back-to-back
Whether two showers may run close together
Bath use
Kitchen hot water demand
Laundry hot water demand
Peak morning and evening usage
Current tank size or flow rate
Whether the current system runs out
Energy source
Available space
Recovery rate
Flow rate for instant gas systems

A family of 5 with one bathroom may need a different system from a family of 6 with two bathrooms and regular simultaneous hot water use.

Best Electric Hot Water System for a Family of 5 or More

A larger electric hot water system can be a practical option for a family of 5 or more if the home already uses electric storage and the household wants a tank-style replacement.

Electric storage may suit a larger family when:

The current system is electric
The home does not have natural gas or LPG
A storage tank setup is preferred
A like-for-like replacement is wanted
The available space suits a larger tank
The selected tank capacity and recovery rate match demand

For larger households, the biggest electric storage risks are undersizing and slow recovery. A small tank may run out quickly if multiple people shower close together. A larger tank may be needed, but it still needs to physically fit and match the property’s electrical requirements.

Electric Hot Water for Larger Families: What to Check

Before choosing electric storage for a family of 5 or more, check:

Current tank capacity
Whether the current system runs out
Number of bathrooms
Daily shower demand
Bath use
Laundry use
Kitchen use
Recovery rate
Power requirements
Dimensions
Connection positions
Indoor or outdoor suitability
Required valves and fittings

If the current electric hot water system often runs out, do not replace it blindly with the same size. Compare larger tanks or other system types before ordering.

Best Heat Pump Hot Water System for a Family of 5 or More

A larger heat pump hot water system can be a strong option for bigger households wanting efficient electric storage hot water, provided the home has a suitable location.

Heat pump hot water may suit a family of 5 or more when:

The home currently has electric storage
The household wants an efficient electric option
Outdoor space is available
Airflow is suitable
Noise considerations can be managed
A larger tank capacity is needed
The household still wants stored hot water
The product dimensions suit the available space

A heat pump should not be chosen by tank size alone. For larger families, the system needs enough capacity, suitable recovery performance and a location that allows the unit to operate properly.

Heat Pump Hot Water for Larger Families: What to Check

Before choosing a heat pump for a family of 5 or more, check:

Tank capacity
Current electric storage size
Whether the current system runs out
Outdoor location
Airflow
Noise rating
Unit dimensions
Electrical requirements
Connection positions
Delivery access
Warranty information
Required valves and fittings

A heat pump can be worth comparing if the family is replacing an older electric storage tank and wants an efficient electric hot water option. The home still needs suitable space and airflow.

Best Gas Hot Water System for a Family of 5 or More

A gas hot water system can suit a larger family if the home already has natural gas or LPG and a stored gas system is preferred.

Gas storage hot water may suit a family of 5 or more when:

The home already uses gas storage
Natural gas or LPG is available
A traditional tank-style replacement is wanted
The selected tank size suits larger household demand
The recovery rate is suitable
The existing gas location works

Gas storage systems are compared by tank capacity, recovery rate, gas type, pressure rating, dimensions and connection positions.

For larger families, recovery rate is especially important. A gas storage system with suitable recovery may perform better during busy periods than a system chosen by tank size alone.

Gas Hot Water for Larger Families: What to Check

Before choosing gas storage for a family of 5 or more, check:

Natural gas or LPG
Current gas storage tank size
Recovery rate
Number of bathrooms
Shower demand
Bath use
Current system performance
Dimensions
Connection positions
Pressure rating
Required valves and fittings

Natural gas and LPG systems are not interchangeable. Always confirm the correct gas type before ordering.

Best Instant Gas Hot Water System for a Family of 5 or More

A higher-flow instant gas hot water system can suit a family of 5 or more when the property has natural gas or LPG and the selected flow rate is matched to household demand.

Instant gas, also called continuous flow gas hot water, heats water as it passes through the unit. It does not store a large tank of heated water.

Instant gas may suit a larger family when:

Natural gas or LPG is already available
The household wants continuous flow hot water
A large storage tank is not preferred
The selected flow rate suits the number of bathrooms
Multiple hot water outlets may be used
The correct gas type is selected
A suitable external location is available

Instant gas systems are usually compared by flow rate in L/min. Larger families often need to compare higher-flow models carefully, especially where there are two bathrooms or frequent simultaneous hot water use.

Instant Gas Hot Water for Larger Families: What to Check

Before choosing instant gas for a family of 5 or more, check:

Natural gas or LPG
Required flow rate in L/min
Number of bathrooms
Number of showers
Whether showers may run at the same time
Bath use
Kitchen and laundry demand
Controller compatibility
Dimensions
Connection positions
Outdoor location suitability
Gas supply suitability
Required valves and fittings

For larger families, choosing too low a flow rate can create daily frustration. The system should be matched to peak demand, not just average use.

16L vs 20L vs 26L Instant Gas for Larger Families

Instant gas systems are often compared by flow rate. Common options include 16 L/min, 20 L/min and 26 L/min models.

Flow Rate	May Suit	Be Careful If
16 L/min	Smaller homes or lower-demand households	The family has 5+ people, two bathrooms or overlapping hot water use
20 L/min	Moderate household demand	Multiple showers or outlets may run close together
26 L/min	Larger homes or higher peak demand	Gas supply and product suitability need to be confirmed

A 26 L/min unit is commonly compared by larger families, but suitability still depends on gas type, gas supply, product specifications and actual household usage.

Best Hot Water System for a Family of 5 With One Bathroom

A family of 5 with one bathroom may not need the same hot water performance as a two-bathroom home, but back-to-back showers can still place heavy demand on the system.

For one-bathroom larger households, compare:

Larger electric storage systems
Larger heat pump hot water systems
Gas storage systems with suitable recovery
Instant gas systems with a flow rate matched to shower demand

The key question is whether everyone showers close together. If showers are spread out, a storage system with suitable recovery may perform well. If showers happen back-to-back every morning, capacity and recovery become more important.

Best Hot Water System for a Family of 5 or More With Two Bathrooms

A family of 5 or more with two bathrooms usually needs careful hot water planning. Two bathrooms increase the chance of simultaneous use, especially during morning and evening routines.

For two-bathroom homes, compare:

Larger electric storage systems
Larger heat pump hot water systems
Gas storage with strong recovery
Higher-flow instant gas hot water systems
Current system performance
Peak usage patterns
Whether two showers may run at once

If two showers may run close together, flow rate and recovery matter heavily. A system that suits a smaller household may not suit a larger two-bathroom home.

Best Hot Water System for a Family of 5 or More With Teenagers

Teenagers can increase hot water use significantly because showers may be longer, more frequent and closer together.

For households with teenagers, consider:

Longer shower duration
Sports and school routines
Morning peak demand
Evening peak demand
Laundry demand
Whether multiple showers happen back-to-back
Whether the current system runs out

A larger storage system, suitable heat pump or higher-flow instant gas system may be worth comparing if the existing system no longer keeps up.

Best Hot Water System for a Family of 5 or More With a Bath

Bath use can significantly increase hot water demand, especially in homes with young children. A larger family with regular bath use may need more storage capacity or stronger hot water performance than a shower-only household.

For homes with regular bath use, compare:

Larger tank capacity
Recovery rate
Heat pump tank size
Gas storage performance
Instant gas flow rate
Whether more hot water is needed soon after the bath

A household that fills a bath and then needs multiple showers shortly after should avoid undersizing the system.

Best Hot Water System for a Family of 5 or More Replacing Electric Storage

If the home currently has electric storage, the main options are another electric hot water system or a heat pump hot water system.

Choose electric storage if:

A straightforward like-for-like replacement is preferred
The current location works well
The home has no gas supply
The household wants a familiar tank-style system
The selected tank capacity suits demand

Compare heat pump if:

The family wants an efficient electric storage option
Outdoor space is available
Airflow is suitable
Noise can be managed
The tank size suits larger household demand

If the current electric tank runs out regularly, compare larger storage options or heat pump systems before ordering.

Best Hot Water System for a Family of 5 or More Replacing Gas Storage

If the home currently has gas storage, compare gas hot water systems and instant gas hot water systems.

Choose gas storage if:

A traditional tank-style replacement is preferred
The existing setup works well
The selected tank size and recovery rate suit demand
The correct natural gas or LPG model is available
The location and connection positions are suitable

Compare instant gas if:

Continuous flow hot water is preferred
A large storage tank is not ideal
The home has suitable gas supply
The selected flow rate suits larger family demand
The system location is suitable

Changing from gas storage to instant gas may involve different requirements, so it should be assessed by licensed tradespeople.

Best Hot Water System for a Family of 5 or More Replacing Instant Gas

If the home already has instant gas, start by checking the current unit’s flow rate and gas type.

A similar instant gas replacement may suit if:

The old system kept up with demand
The family size has not changed
Bathroom count has not changed
The current flow rate worked well
Natural gas or LPG type is confirmed
Controller requirements are the same

A higher-flow model may be worth comparing if:

The old system struggled during showers
Another bathroom has been added
More people now live in the home
The household uses multiple outlets at once
Hot water performance has become unreliable

Browse instant gas hot water systems by flow rate, gas type, brand and product specifications.

Best Hot Water System for a Large Family During a Renovation

Renovations are a good time to reassess the hot water system because demand may increase after the work is complete.

A renovation may add:

A second or third bathroom
A larger bath
More showers
A larger laundry
A new kitchen layout
A granny flat or separate living area
More simultaneous hot water use

For larger families, plan hot water around the finished home, not the current home. If the renovation will increase demand, the old system size may no longer be suitable.

For renovation projects, also check whether you need valves, pipework and fittings.

Best Hot Water System for a Large Rental Property

A larger rental property may need a hot water system that suits family-level demand. If the property has four or more bedrooms, multiple bathrooms or is likely to house a larger household, the system should not be undersized.

For larger rentals, compare:

Existing system type
Number of bedrooms
Number of bathrooms
Likely tenant demand
Tank capacity or flow rate
Like-for-like replacement options
Brand recognition
Warranty information
Required valves and fittings
Delivery access

A cheap undersized system may create tenant complaints and poor performance. The system should match the property’s expected use.

Best Hot Water System for a Large Family on a Budget

If budget is important, start by comparing the system type already installed. A like-for-like replacement may be more practical than changing energy source or system type.

Budget-friendly tips for large households:

Start with the existing system type
Compare suitable tank sizes or flow rates
Do not undersize the system to save money
Avoid unnecessary oversizing
Check current product pricing
Check warranty information
Check required valves and fittings
Check delivery costs
Confirm installation and connection costs separately

For a large family, the cheapest system is only a good choice if it can keep up with daily demand.

Best Hot Water Brands for Larger Families

Hot Water Outlet lists recognised hot water brands across electric, gas, heat pump and instant gas categories.

Depending on the system type, larger families may want to compare:

Brand can help narrow the search, but the final decision should be based on tank capacity, recovery rate, flow rate, gas type, dimensions, household demand and product specifications.

Valves, Fittings and Accessories for Larger Hot Water Systems

A hot water order for a larger family may need more than the main unit. Depending on the replacement setup, water pressure and product requirements, extra valves, fittings or pipework may be needed.

Common items include:

Tempering valves
Pressure relief valves
Duo valves
Non-return valves
Isolation valves
Copper pipework
Fittings
Controller accessories
Thermostats
Elements
Connection parts

Hot Water Outlet has a dedicated range of valves, pipework and fittings to help customers compare common hot water accessories.

Always confirm compatibility before ordering.

Common Mistakes Larger Families Make When Choosing Hot Water

Choosing the Cheapest System Only

A cheap hot water system may not suit a family of 5 or more if it is too small, has the wrong flow rate or does not match the property.

Replacing With the Same Size Without Checking Demand

The old system may not suit the household anymore, especially if children are older, another bathroom has been added or usage has increased.

Ignoring Peak Demand

A large family may not use hot water evenly throughout the day. Morning and evening peaks can be the real test.

Choosing Too Low a Flow Rate

For instant gas, a low flow rate may struggle if two bathrooms or multiple outlets are used.

Ignoring Recovery Rate

For storage systems, recovery rate affects how quickly the tank can heat more water after use.

Forgetting Gas Type

Natural gas and LPG systems are not interchangeable. Always choose the correct gas type.

Forgetting Heat Pump Location Requirements

Heat pumps need suitable outdoor space, airflow and noise consideration. Do not choose a heat pump by tank size alone.

Forgetting Valves and Fittings

The main hot water unit may not be the full order. Valves, pipework and fittings may also be required.

Assuming DIY Is Suitable

Hot water systems involve plumbing, gas and electrical work. These tasks should be completed by licensed tradespeople.

Large Family Hot Water Buyer Checklist

Before ordering a hot water system for a family of 5 or more, check:

Current hot water system type
Current brand and model
Current tank size or flow rate
Whether the current system runs out
Electricity, natural gas or LPG
Number of people in the home
Number of bathrooms
Number of showers per day
Bath use
Laundry use
Kitchen use
Whether outlets are used at the same time
Morning and evening peak demand
Desired system type
Tank capacity if storage
Flow rate in L/min if instant gas
Recovery rate
Dimensions
Connection positions
Heat pump airflow if relevant
Heat pump noise rating if relevant
Gas type if choosing gas
Power requirements
Required valves and fittings
Delivery access
Warranty information
Product specifications

Compare Hot Water Systems for a Family of 5 or More Online

Hot Water Outlet makes it easier to compare hot water systems for larger family homes by system type, brand, size, energy source and product specifications.

Start with:

FAQs About Hot Water Systems for a Family of 5 or More

What is the best hot water system for a family of 5 or more?

The best hot water system for a family of 5 or more depends on the energy source, number of bathrooms, shower habits, bath use, laundry demand and current setup. Larger electric storage, larger heat pumps, gas storage and higher-flow instant gas systems can all suit bigger households when sized correctly.

What size electric hot water system does a family of 5 need?

A family of 5 will usually need a larger electric storage system than a small household, especially if showers happen close together or there are multiple bathrooms. Check tank capacity, recovery rate and whether the current electric system runs out.

What size heat pump does a family of 5 or more need?

A larger family usually needs a heat pump with enough tank capacity for daily use. The right size depends on the number of bathrooms, shower habits, bath use, laundry use and peak demand. The home also needs suitable outdoor space and airflow.

What size instant gas hot water system does a large family need?

A larger family should compare instant gas systems by flow rate in L/min. Homes with two bathrooms, back-to-back showers or simultaneous hot water use may need a higher-flow model than smaller homes.

Is a 16L instant gas hot water system enough for a family of 5?

A 16 L/min instant gas system may be too small for many families of 5, especially if there are two bathrooms or multiple outlets used at the same time. Compare flow rate carefully before ordering.

Is a 26L instant gas hot water system good for a family of 5 or more?

A 26 L/min instant gas system is commonly compared for larger households, but suitability depends on natural gas or LPG type, gas supply, number of bathrooms, peak demand and product specifications.

Is heat pump hot water good for large families?

Heat pump hot water can suit large families if the tank capacity matches demand and the home has suitable outdoor space, airflow and noise conditions. It is often compared when replacing old electric storage.

Is gas or electric hot water better for a large family?

Gas may suit a large family if the home already has natural gas or LPG. Electric may suit a large family if the home already has electric storage or no gas supply. Heat pump may be worth comparing as an efficient electric option.

Should a large family replace the old hot water system with the same size?

Only if the old system has been keeping up with demand. If the family regularly runs out of hot water, has added another bathroom or uses more hot water than before, compare larger sizes or different system types.

Do larger hot water systems need valves and fittings?

Some larger hot water systems and replacements require valves, pipework or fittings depending on the system type, pressure rating and connection layout. Browse valves, pipework and fittings and confirm compatibility before ordering.

Can I install a large family hot water system myself?

No. Hot water systems involve plumbing, gas and electrical work that should be completed by appropriately licensed tradespeople. Hot Water Outlet sells supply-only hot water systems and accessories online, and may help organise quotes from reputable installers where appropriate.

Find the Best Hot Water System for Your Larger Family

The best hot water system for a family of 5 or more is the one that suits your household demand, energy source, available space and replacement setup. Larger families should pay close attention to tank capacity, flow rate, recovery rate, gas type, dimensions, connection positions, warranty information and required accessories.

Browse hot water systems online with Hot Water Outlet to compare electric, heat pump, gas, instant gas, instant electric and hot water accessories by brand, size and product specifications.

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