Best Hot Water System for Airbnbs and Short-Term Rentals

Choosing the best hot water system for an Airbnb or short-term rental is about more than just household size. Guests often use more hot water than expected, back-to-back bookings leave little time for issues, and a lack of hot water can quickly lead to complaints. At Hot Water Outlet, you can compare supply-only hot water systems online, including electric hot water systems, gas hot water systems, instant gas hot water systems, heat pump hot water systems and compatible valves, pipework and fittings.

Quick Answer

For most Airbnbs and short-term rentals, the best hot water system is usually a reliable, correctly sized system that can handle peak guest demand.

For houses with multiple bathrooms, a larger electric hot water system, suitable heat pump hot water system, or high-flow instant gas hot water system may be worth comparing.

For smaller apartments, studios and one-bedroom short-term rentals, a compact electric storage system or existing instant gas replacement may suit, depending on the property setup.

The safest choice is usually not the smallest system that technically works. It is the system that gives guests enough hot water during peak use without creating unnecessary complexity, compliance issues or access problems.

Best Hot Water System Options for Airbnbs

Why Short-Term Rentals Need More Hot Water Capacity

Airbnb and short-term rental guests do not always use hot water the same way a normal household does.

A normal family may have predictable shower times. Guests may all shower at once before a wedding, event, beach trip, dinner booking or checkout. They may also use washing machines, baths, dishwashers and multiple bathrooms in a short period.

Hot water demand can be higher because of:

• Back-to-back showers

• Multiple guests getting ready at once

• Baths or spa baths

• Washing machine use

• Dishwasher use

• Guests unfamiliar with water-saving habits

• Higher expectations from paying guests

• Weekend peak loads

• Back-to-back bookings with limited recovery time

For short-term rentals, undersizing the system can create more problems than the upfront saving is worth.

Key Buyer Checks Before Choosing a System

Before buying a supply-only hot water system online, check:

• Number of guests the property sleeps

• Number of bathrooms

• Whether showers may run at the same time

• Whether the property has a bath or spa

• Existing system type

• Available energy source

• Natural gas or LPG if using gas

• Electrical supply and switchboard capacity

• Outdoor airflow if considering heat pump

• Drainage location

• Noise placement

• Access for delivery and future servicing

• Existing valves and fittings

• Whether compliance upgrades may be needed

Supply-only pricing usually does not include installation, plumbing labour, electrical work, gas fitting, old unit removal, disposal, valves, fittings, pipework changes, drainage work, switchboard upgrades, gas upgrades, regulator changes, LPG bottle work, controller wiring, compliance upgrades, concrete bases, platforms or delivery beyond what is shown at checkout.

Electric Hot Water Systems for Airbnbs

Electric hot water systems can suit many short-term rentals, especially where the existing property already has electric storage.

Electric storage systems are simple, familiar and available in a wide range of sizes. They may suit Airbnbs where reliability, straightforward replacement and low appliance complexity are priorities.

Electric Storage May Suit When

• The property already has electric storage

• There is no gas connection

• The system is located in a garage, cupboard, laundry or outdoor area

• A simple like-for-like replacement is preferred

• Noise needs to be minimal

• The property has predictable guest capacity

Electric Storage Buyer Checks

Check:

• Tank capacity

• Element size

• Recovery rate

• Available space

• Indoor or outdoor rating

• Connection locations

• Safe tray requirements

• Tempering valve requirements

• Existing electrical supply

• Off-peak tariff setup if applicable

For short-term rentals, it is often better to allow extra hot water capacity rather than size the system too tightly. A system that works for a normal family of four may struggle if six guests all shower back-to-back.

Heat Pump Hot Water Systems for Airbnbs

Heat pump hot water systems may suit Airbnbs where energy efficiency is important and the property has a suitable outdoor location.

Heat pumps are commonly compared for replacing larger electric storage systems, especially where the property has solar power or regular hot water use.

Brands often compared include iStore hot water systems, Stiebel Eltron hot water systems, Envirosun hot water systems and Emerald Energy.

Heat Pumps May Suit When

• The property has suitable outdoor airflow

• Condensate drainage can be managed

• Noise placement is suitable

• The system will not disturb guests or neighbours

• The electrical setup is suitable

• The property has solar power

• Energy efficiency is a priority

• The tank size suits guest demand

Heat Pumps May Not Suit When

• The only location is a tight cupboard

• The system would be too close to bedrooms

• The property has strict body corporate rules

• Drainage is difficult

• The outdoor area has poor airflow

• Guests may be disturbed by operating noise

• There is no easy access for future servicing

Heat pump rebates, STCs and incentives can change and depend on the product, installer, property, purchase type and program rules. Do not assume a rebate applies without checking current eligibility.

Instant Gas Hot Water Systems for Airbnbs

Instant gas hot water systems, also called continuous flow gas systems, can suit short-term rentals with natural gas or LPG where high hot water demand is expected.

Instant gas systems heat water as it is used rather than storing a full tank. This can be useful for properties with several guests, provided the unit is sized correctly and the gas supply is suitable.

Common brands include Rinnai hot water systems, Bosch hot water systems and Rheem hot water systems.

Instant Gas May Suit When

• The property already has instant gas

• Natural gas or LPG is available

• The correct gas type is selected

• The gas pipe sizing is suitable

• The property has multiple bathrooms

• Tank storage space is limited

• High recovery is important

Natural gas and LPG are not interchangeable. A natural gas unit must not be connected to LPG unless it is specifically converted and approved by a licensed gas fitter, and an LPG unit must not be connected to natural gas unless the same applies.

External gas hot water units are outdoor/external only unless the product is specifically designed and approved for internal or flued installation.

Instant Gas Buyer Checks

Check:

• Natural gas or LPG

• Existing unit flow rate

• Number of bathrooms

• Number of guests

• Gas pipe sizing

• Minimum flow rate

• Water pressure

• Controller compatibility

• Flue requirements

• Clearances to windows, doors and openings

• Whether the unit is external or internal/flued

For larger Airbnbs, a higher-flow unit may be needed. However, the gas supply must be able to support it.

Gas Storage Hot Water Systems for Airbnbs

Gas hot water systems may suit properties where gas storage already exists and a like-for-like replacement is preferred.

Gas storage can provide a familiar tank-style setup while using gas as the energy source. It may suit some rentals, but the correct gas type, ventilation, flue setup and compliance requirements need to be checked carefully.

Brands commonly compared for storage-style systems include Rheem, Dux and Vulcan.

Instant Electric Hot Water Systems for Short-Term Rentals

Instant electric hot water systems may suit small point-of-use applications, but they are not always ideal for whole-property Airbnb use.

They often need significant electrical capacity to supply high-flow hot water. For a whole home or multi-guest rental, this can be a major limitation.

Instant Electric May Suit

• Small studios

• Kitchenettes

• Hand basins

• Single outlet use

• Compact properties with low hot water demand

Instant Electric May Not Suit

• Multiple bathrooms

• Back-to-back showers

• Large guest groups

• Homes with limited electrical capacity

• Whole-home high-flow use

Before buying instant electric, confirm the required electrical supply with a licensed electrician.

What Size Hot Water System Does an Airbnb Need?

Short-term rental sizing should be based on guest capacity, not just bedrooms.

The right size depends on shower flow rates, guest behaviour, bathrooms, baths, recovery rate and whether multiple fixtures are used at the same time.

Best Hot Water System for Different Short-Term Rental Types

Best for Small Airbnb Apartments

For small apartments, a compact electric hot water system may be the most practical option if the property already uses electric storage.

If the apartment already has instant gas, a suitable instant gas hot water system may also be worth comparing.

Best for Family Holiday Homes

Family holiday homes often need more capacity because guests may shower after the beach, use washing machines, run dishwashers and use multiple bathrooms.

A larger electric storage system, suitable heat pump or correctly sized instant gas system may suit, depending on the property services.

Best for Luxury Short-Term Rentals

Luxury rentals usually need stronger hot water performance because guest expectations are higher. Larger storage capacity, higher recovery and correct bathroom sizing matter more than choosing the cheapest system.

If the property has multiple ensuites, baths or outdoor showers, sizing should be checked carefully before ordering.

Best for Off-Grid or Semi-Rural Rentals

Semi-rural rentals may use LPG, electric storage, heat pump or solar-supported systems, depending on available services.

For LPG properties, check the bottle setup, regulator, gas sizing and gas type. For electric or heat pump systems, check electrical supply, solar setup, outdoor airflow and drainage.

Best for Coastal Holiday Rentals

Coastal rentals need extra care around system location and exposure. Salt air, wind, weather and outdoor placement may affect product selection and long-term suitability.

For coastal homes, check whether the system location is protected, accessible and suitable for the selected model.

Important Airbnb Hot Water Features to Consider

1. Recovery Rate

Recovery rate matters because guests often use hot water in short bursts. A system with better recovery can return to usable temperature faster after heavy use.

2. Tank Size

Tank size matters for storage systems. Too small, and guests may run out of hot water. Too large, and the system may cost more to buy and run than needed.

3. Flow Rate

Flow rate matters for instant gas systems. A unit that suits one shower may not suit two bathrooms being used at once.

4. Noise

Noise matters for heat pumps and some outdoor systems. Avoid placing noisy equipment near bedrooms, neighbours or guest entertaining areas.

5. Guest Simplicity

Short-term rentals should be simple for guests. Avoid setups that require guests to understand timers, boosters, switches or complex controls unless instructions are clear.

6. Access for Maintenance

Short-term rentals need easy access for future servicing and replacement. A system hidden in a difficult location may create problems later.

Common Mistakes When Buying Hot Water for Airbnbs

Sizing for Normal Use Instead of Guest Use

A short-term rental may sleep more people than a normal household would have living there. Size for realistic guest demand.

Choosing the Cheapest System Only

The cheapest unit may not be the best choice if it causes guest complaints, poor recovery or frequent hot water shortages.

Ignoring Simultaneous Showers

Multiple bathrooms can create high demand. Check whether guests are likely to use showers at the same time.

Forgetting About Baths and Outdoor Showers

Baths, spa baths and outdoor showers can increase hot water demand significantly.

Buying the Wrong Gas Type

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

Installing External Gas Units Indoors

External gas hot water units are outdoor units unless specifically designed and approved for internal or flued installation.

Ignoring Heat Pump Placement

Heat pumps need airflow, drainage and sensible noise placement. They are not suitable for every location.

Forgetting Valves and Fittings

Replacement work may require new valves, fittings and compliance parts. You can compare compatible valves, pipework and fittings online.

Best Brands for Airbnb Hot Water Systems

The best brand depends on system type, guest demand and property setup.

Rheem

Rheem hot water systems are commonly compared for electric storage, gas storage, instant gas and heat pump options. Rheem may suit buyers wanting a broad range of common replacement sizes.

Rinnai

Rinnai hot water systems are commonly compared for instant gas and continuous flow hot water systems, especially where strong flow and gas hot water performance are priorities.

Dux

Dux hot water systems are often compared for electric storage and gas storage systems. Dux may suit practical tank-style replacements.

Bosch

Bosch hot water systems are commonly compared for instant gas systems and compact gas hot water applications.

Vulcan

Vulcan hot water systems are often considered for budget-conscious electric and gas storage replacements.

iStore

iStore hot water systems are commonly compared in the heat pump category, especially for homes moving away from standard electric storage.

Stiebel Eltron

Stiebel Eltron hot water systems may suit buyers comparing electric, heat pump and instant electric options.

Envirosun and Emerald Energy

Envirosun hot water systems and Emerald Energy are often compared for heat pump hot water systems where site conditions suit.

Buyer Checklist Before Ordering Online

Before ordering a supply-only hot water system for an Airbnb or short-term rental, confirm:

• How many guests the property sleeps

• Number of bathrooms

• Whether showers may run at the same time

• Whether there is a bath, spa or outdoor shower

• Existing system type

• Existing tank size or gas flow rate

• Natural gas or LPG if applicable

• Electrical supply

• Switchboard capacity

• Outdoor airflow for heat pumps

• Drainage requirements

• Noise placement

• Body corporate approval if applicable

• Access for delivery

• Access for future servicing

• Required valves and fittings

• Licensed trade requirements

Plumbing, gas fitting and electrical work must be completed by appropriately licensed tradespeople.

FAQ: Best Hot Water System for Airbnbs and Short-Term Rentals

What is the best hot water system for an Airbnb?

The best hot water system for an Airbnb is usually a reliable, correctly sized system that matches the property’s existing services and guest capacity. Electric storage, heat pump and instant gas systems may all suit different properties.

Should I oversize hot water for an Airbnb?

It can be sensible to allow extra capacity because short-term rental guests may use more hot water than a normal household. However, the system still needs to suit the property, available space, energy source and compliance requirements.

Is instant gas good for short-term rentals?

Instant gas can be a good option where natural gas or LPG is available and the gas supply is suitable. It is especially useful for homes with higher hot water demand, but the correct flow rate and gas type must be selected.

Is a heat pump good for an Airbnb?

A heat pump may suit an Airbnb if there is suitable outdoor airflow, drainage, electrical setup and noise placement. It may be worth comparing for energy-conscious properties or homes with solar power.

What size hot water system do I need for a holiday rental?

Size depends on guest numbers, bathrooms, baths, shower flow rates and how often multiple fixtures are used at once. A rental that sleeps six usually needs more hot water capacity than a normal two-person household.

Can I use a small electric hot water system for an Airbnb?

A small electric system may suit a studio or one-bedroom rental with low demand, but it may struggle in larger properties or where guests shower back-to-back.

Does supply-only pricing include installation?

No. Supply-only pricing generally does not include installation, plumbing labour, electrical work, gas fitting, valves, fittings, old unit removal, disposal, pipework changes or compliance upgrades.

Can Hot Water Outlet install the system?

Hot Water Outlet sells supply-only hot water systems and accessories online. Plumbing, gas fitting and electrical work must be completed by appropriately licensed tradespeople. Where appropriate, Hot Water Outlet may help organise quotes from reputable installers.

Final Thoughts

For Airbnbs and short-term rentals, the best hot water system is the one that can handle real guest demand without creating unnecessary complexity. Electric storage may suit simple replacements, heat pumps may suit energy-conscious properties with suitable outdoor space, and instant gas may suit homes with strong gas supply and higher hot water demand.

Browse hot water systems, compare electric hot water systems, heat pump hot water systems, gas hot water systems, instant gas hot water systems and compatible valves, pipework and fittings online at Hot Water Outlet.