Bathroom Renovation Planning: Hot Water, Water Pressure and Product Choices to Check Before You Tile

May 26, 2026

A bathroom renovation is not just about tiles, tapware and vanities. Before the bathroom is waterproofed and finished, it is worth checking whether the home’s hot water system, water pressure, filtration, pumps and plumbing layout will still suit the new space.

This matters because a renovated bathroom can change how the home uses water. A larger shower head, freestanding bath, twin shower, extra ensuite or upgraded fixtures may increase hot water demand, expose low water pressure or make an older hot water system feel undersized.

Installed Today can help homeowners compare product options such as hot water systems, heat pump hot water systems, electric hot water systems, gas hot water systems, instant gas hot water systems, water filters and mains water pressure boosting pumps.

For bathroom renovation plumbing, rough-ins, toilet relocation, drainage changes, fixture fit-off, leak repairs, gas work or on-site plumbing advice, use a licensed plumber such as JR Gas & Water through their bathroom renovation plumbing service or broader plumbing services across Greater Brisbane and the Gold Coast.

Quick answer

Before waterproofing and tiling a bathroom, homeowners should check whether the existing hot water system, water pressure, pipework, drainage, toilet set-out, shower waste, vanity plumbing and fixture choices suit the new layout. Installed Today can help compare replacement products such as hot water systems, water filters and pressure pumps, but bathroom renovation plumbing and on-site service work should be handled by a licensed plumber.

Why product planning matters before the bathroom is finished

Once a bathroom is waterproofed and tiled, changing plumbing, pipework or fixture locations becomes harder and more expensive.

That is why product choices should be considered early, especially if the renovation includes:

A larger shower head
Twin showers
A freestanding bath
An extra ensuite
A wall-hung vanity
A toilet relocation
New hot water demand
Better water pressure expectations
Drinking water filtration
Whole-home water filtration
A rainwater or pressure pump setup
Changes to gas or electric hot water

Even if Installed Today is not completing the bathroom plumbing work, it can help homeowners compare product categories before they commit to a renovation design.

The key is to separate product selection from licensed trade work. Product comparison can happen online. Plumbing alterations, installation, gas fitting, drainage and electrical work need the correct licensed trades.

When Installed Today can help

Installed Today is best suited to comparing product options before or during a renovation.

This may include:

Replacing an old hot water system before the new bathroom is finished
Comparing electric, gas, instant gas or heat pump hot water options
Checking whether a heat pump may suit a home with solar PV
Comparing water filtration options for a renovated bathroom or kitchen
Replacing filter cartridges or service kits
Comparing pressure boosting pumps where water pressure is a concern
Comparing rainwater pump options where the home uses tank water
Planning product choices before a plumber finalises the renovation scope

Installed Today can help compare:

For renovation plumbing, rough-ins, toilet changes, drainage, leak repairs, gas fitting, electrical work or fixture installation, use the right licensed trade.

When JR Gas & Water is the better next step

Bathroom renovations involve plumbing work that should be handled by licensed trades.

Use JR Gas & Water for:

Bathroom renovation plumbing
Plumbing services across Greater Brisbane and the Gold Coast
Toilet relocation and fixture plumbing
Shower waste and floor waste planning
Vanity plumbing
Rough-in and fit-off plumbing
Drainage alterations
Pipework replacement
Leak detection and water leak repairs
Burst pipe repairs
Hot water repairs and servicing
Gas fitting where gas work is involved

Installed Today can help with product comparison. JR Gas & Water can help when the renovation needs site assessment, licensed plumbing, gas fitting, drainage or repair work.

Hot water should be checked before renovating a bathroom

A new bathroom can expose an old hot water problem.

The existing system may have been acceptable with a smaller shower or older fixtures, but it may struggle once the home adds a larger shower, bath or extra bathroom.

Check the hot water system if:

The current system already runs out
Recovery time is slow
The system is old or unreliable
The renovation includes a larger shower head
A freestanding bath is being added
Twin showers are planned
More people will use hot water at once
The household has grown
You are adding a second bathroom or ensuite
You want to compare running cost options

If the current system is due for replacement, compare hot water systems before the bathroom is finished. The right system depends on the home, not just the bathroom.

Comparing hot water options for a bathroom renovation

Heat pump hot water

A heat pump can reduce running costs compared with standard electric storage when selected and installed correctly. It may suit homes with suitable outdoor space, airflow and household demand.

Compare heat pump hot water systems if the renovation is part of a broader upgrade away from standard electric storage.

Electric hot water

Electric storage can suit homes wanting a familiar replacement type, especially where the existing setup is simple and the household demand is predictable.

Compare electric hot water systems if you want a conventional storage option.

Gas hot water

Gas hot water may suit homes with suitable gas supply and existing gas infrastructure.

Compare gas hot water systems where a gas storage-style replacement is being considered.

Instant gas hot water

Instant gas can suit homes wanting continuous flow hot water, but sizing, gas supply, flow rates and installation conditions matter.

Compare instant gas hot water systems if the renovation includes higher hot water use or a shift away from storage.

Instant electric hot water

Instant electric systems can suit selected applications, but they are not automatically suitable for every whole-home bathroom renovation. Electrical capacity and expected flow rate are important.

Compare instant electric hot water systems where the application is suitable.

Shower upgrades can change hot water demand

A new shower can use more hot water than the old one, especially if the renovation includes:

Larger shower heads
Twin showers
Rainfall showers
Longer shower times
Higher-flow fixtures
Multiple bathrooms being used at once

This does not mean every renovation needs a new hot water system. It does mean the current system should be considered before the bathroom is finished.

If an old system is already borderline, the renovation may make the problem more noticeable. Comparing replacement hot water systems before the final fit-off can help avoid disappointment after the bathroom is complete.

Bath additions can expose undersized hot water systems

A freestanding bath or larger bath can look great in a renovation, but it may place more demand on the hot water system.

Before choosing a bath, consider:

Bath capacity
Existing hot water storage size
Recovery time
Number of people in the home
How often the bath will be used
Whether showers and the bath may be used at the same time
Whether the current hot water system is already old

A bath is not just a design choice. It can affect the practical hot water needs of the household.

Water pressure should be checked before choosing fixtures

Water pressure can affect how the finished bathroom feels.

Low pressure may become more obvious after installing:

Larger shower heads
Twin showers
Wall mixers
Extra bathrooms
Rainfall-style outlets
New water filters
Long pipe runs
Tank water systems

If the whole home has poor pressure, it may be worth comparing mains water pressure boosting pumps. If the home uses tank water, compare rainwater pumps or rain harvesting pump sets.

Pump selection should be matched to the home’s pipework, water source, demand and installation requirements. For pump installation, pipework and on-site plumbing, use a licensed plumber such as JR Gas & Water through their rainwater tank plumbing and pump connections.

Water filters and bathroom renovations

Bathroom renovations often happen at the same time as broader home upgrades. If the household is already reviewing plumbing and water quality, it may also be a good time to compare water filtration options.

Installed Today can help compare:

Whole-home filtration may be relevant when the homeowner wants filtered water throughout the property. Drinking water systems or reverse osmosis may be more relevant for kitchens or specific drinking water points.

The right filter depends on water source, household demand, pressure, installation location and cartridge requirements. Plumbing changes and installation should be handled by licensed trades.

Product choices to confirm before rough-in

Before the plumber roughs in the bathroom, confirm the products and fixtures that affect plumbing set-out.

These may include:

Toilet type and set-out
Vanity type and drawer layout
Basin type
Basin mixer or wall mixer
Shower mixer
Shower outlet
Bath type
Bath spout location
Floor waste and grate style
Hot water system plans
Filter plans
Pressure pump plans
Any future water point requirements

Installed Today is most relevant for hot water, filtration and pump product comparison. For toilets, tapware, shower fixtures and bathroom plumbing set-out, work directly with the licensed plumber or renovation team.

Renovation plumbing should be planned before waterproofing

Waterproofing and tiling should happen after the plumbing layout is correct.

A licensed plumber should confirm:

Toilet set-out
Shower waste location
Floor waste location
Vanity water and waste positions
Bath water and waste positions
Mixer depth
Pipe condition
Water pressure
Drainage fall
Hot water supply
Tempering requirements where applicable
Testing before close-up

JR Gas & Water’s bathroom renovation plumbing service is the correct pathway for bathroom rough-in, drainage changes, fixture fit-off and renovation plumbing support.

Common product planning mistakes in bathroom renovations

Avoid these common mistakes:

Choosing a large shower without checking hot water capacity
Adding a bath without checking storage or recovery
Buying fixtures before confirming pipe locations
Forgetting water pressure requirements
Comparing hot water systems too late
Leaving an old unreliable hot water system until after the renovation
Assuming a pressure pump will fix every low-pressure issue
Adding filtration without checking pressure and cartridge requirements
Ignoring outdoor space, noise and drainage for heat pumps
Treating product selection and plumbing installation as the same thing

Good planning separates the product decision from the site work. The product still needs to suit the home, and the licensed trades still need to confirm what can be installed safely and correctly.

Older Brisbane homes and bathroom renovations

Older Brisbane homes can have hidden plumbing and product challenges.

Common issues include:

Older pipework
Low or inconsistent pressure
Previous renovation changes
Old electric hot water systems
Limited space for new hot water units
Narrow side access
Clay soil and drainage issues
Established trees affecting drains
High-set homes with long pipe runs
Mixed old and new plumbing

If the home has an older hot water system, the renovation is a sensible time to compare replacement electric hot water, heat pump hot water or gas hot water options.

For the plumbing work itself, use JR Gas & Water’s plumbing services across Greater Brisbane and the Gold Coast.

Gold Coast bathroom renovation considerations

Gold Coast homes can have different renovation conditions.

Common considerations include:

Coastal corrosion
Duplex and townhouse access
Flat blocks with drainage limits
Slab homes
Body corporate requirements
Tight outdoor unit locations
Heat pump noise and airflow placement
Gas availability
Outdoor hot water exposure
Shared services in some properties

For product comparison, Installed Today can help homeowners review hot water, pump and filtration options. For bathroom plumbing, access, drainage or installation work, use licensed trades.

Slab homes, townhouses and units

Bathroom renovations in slab homes, townhouses and units need careful planning before products are ordered.

Questions to ask include:

Can the toilet waste move?
Can the shower waste move?
Is concrete cutting required?
Is the bathroom upstairs?
Are there rooms or units below?
Are services shared?
Does body corporate approval apply?
Will a new hot water system fit in the existing location?
Is there space and airflow for a heat pump?
Is water pressure suitable for the chosen fixtures?

Installed Today can help with product comparison, but the plumber needs to confirm whether the site can support the selected products and layout.

Renovation timing: when to compare products

The best time to compare product options is before the rough-in is finalised.

For hot water, pumps and filters, compare early if:

The old system is already unreliable
The bathroom layout is changing
Hot water demand is increasing
Water pressure is poor
The home uses tank water
The renovation includes a new ensuite
The homeowner wants filtered water
Outdoor equipment needs relocation
A heat pump may be considered
Gas or electric options are being compared

Leaving these decisions until after tiling can make the project more awkward, especially if pipework or power supply needs to change.

What homeowners can safely plan themselves

Homeowners can prepare useful details before speaking with trades.

Helpful details include:

Existing hot water system type
Photos of the hot water system label
Number of bathrooms
Number of people in the home
Preferred shower and bath style
Whether a bath is being added
Existing water pressure issues
Whether the home uses mains water or tank water
Whether filters are already installed
Whether pumps are already installed
Photos of the bathroom and outdoor service areas
Any body corporate or access restrictions

Do not move pipework, alter drains, modify valves, adjust gas components, open electrical equipment or attempt plumbing work yourself.

What needs a licensed trade

Use licensed trades for:

Bathroom renovation plumbing
Rough-in plumbing
Fixture fit-off
Toilet relocation
Shower waste installation
Floor waste planning
Drainage changes
Pipework alterations
Pump installation
Filter installation
Hot water installation
Hot water repairs
Leak detection
Gas fitting
Electrical work

Gas work should always be completed by a licensed gas fitter. Electrical work should always be completed by a licensed electrician.

Installed Today can help compare products. The site work should be handled by the correct licensed trade.

FAQs

Can Installed Today help with a bathroom renovation?

Installed Today can help with product comparison for hot water systems, water filters and pumps that may be relevant during a bathroom renovation. Bathroom renovation plumbing, rough-ins, fixture fit-off, drainage and installation work should be handled by licensed plumbers such as JR Gas & Water.

Should I replace my hot water system during a bathroom renovation?

It may be worth considering if the current system is old, unreliable, undersized or already running out of hot water. A new bathroom with a larger shower, bath or extra ensuite can increase hot water demand.

What hot water system is best for a bathroom renovation?

There is no single best option for every home. Heat pump, electric, gas, instant gas and instant electric systems all suit different situations. The right choice depends on household size, available space, energy supply, gas availability, usage patterns and installation requirements.

Can a new shower reduce hot water performance?

A new shower can make hot water issues more noticeable if it has a higher flow rate or if more bathrooms are used at once. If the existing system is already struggling, compare hot water replacement options before the renovation is complete.

Should I check water pressure before choosing bathroom fixtures?

Yes. Water pressure can affect how showers, mixers and baths perform. If pressure is poor across the whole home, it may be worth comparing pressure boosting options and getting licensed plumbing advice before finalising fixtures.

Can I add water filtration during a renovation?

Yes, but the right filter depends on the home, water source, pressure and where filtered water is needed. Installed Today can help compare whole-home filtration, drinking water filtration, reverse osmosis and filter cartridge options.

Does Installed Today install bathroom plumbing?

Installed Today is product-focused and should not be treated as a bathroom renovation plumbing service. For bathroom plumbing, rough-ins, fixture fit-off, drainage, gas fitting, repairs or installation work, use licensed trades such as JR Gas & Water.

Who should I contact for bathroom renovation plumbing in Brisbane or the Gold Coast?

For bathroom renovation plumbing in Brisbane, the Gold Coast and nearby SEQ areas, use JR Gas & Water’s bathroom renovation plumbing service. Installed Today can help with product comparison where hot water, filtration or pumps are part of the renovation planning.

Planning a bathroom renovation?

Before waterproofing and tiles go in, make sure the product choices and plumbing requirements line up.

Installed Today can help you compare hot water systems, heat pump hot water systems, electric hot water systems, gas hot water systems, instant gas hot water systems, water filters, rainwater pumps and mains water pressure boosting pumps.

For bathroom renovation plumbing, rough-ins, fixture fit-off, drainage changes, hot water installation, pump installation, leak repairs or on-site plumbing support, book JR Gas & Water through the bathroom renovation plumbing page or the quote request and bookings page.

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