A boiling and chilled water tap occupies little space above the bench, but the equipment below can compete with bins, sink plumbing, cleaning products and pull-out shelves. The first question in an existing kitchen is whether the complete system can fit, breathe and be serviced. A cabinet that can hold the box is not necessarily a cabinet that can support the installation.
Choose the tap location, underbench equipment and service connections together. Measure the retained kitchen carefully, review the exact model’s installation requirements and settle any cabinet alterations before making a hole in the benchtop.
Define the water functions you will use
Start with the required combination. Boiling and chilled drinking water is different from a tap that also replaces the normal kitchen mixer or supplies sparkling water. Additional functions can change the equipment, plumbing and storage space required.
Consider the household’s busiest period rather than its average daily use. Several people filling bottles before school can place different demands on chilled capacity from occasional glasses throughout the day. Ask the supplier how the selected system performs during that pattern and how it recovers afterwards.
For boiling water, think about the vessels you actually fill. A tall teapot, large mug or cooking jug needs suitable space under the outlet and a stable filling position. Check the control action with those tasks in mind.
A system should be selected for the household rather than a commercial capacity figure that sounds impressive. Extra capacity may mean additional cabinet space, electrical demand or expense without a useful benefit in a small kitchen.
Measure the cupboard as an occupied space
Empty the proposed cabinet and record its internal width, depth and height. Then identify everything that must remain: sink bowls, waste pipes, isolation valves, hinges, door hardware and structural cabinet rails. External cabinet dimensions can conceal a much smaller usable area.
Include the route through the door opening. A unit may fit within the carcass but be difficult to manoeuvre past a centre stile or fixed shelf. Ask how the equipment will enter during installation and leave for a future repair.
Record protrusions at the rear and sides. A pipe behind the unit can prevent it sitting at the intended depth, while a hinge can obstruct a filter door. The installer should assess the working arrangement with all retained components shown.
Separate three kinds of space
The system needs its physical footprint, the clearances required for operation and the space needed for servicing. Treat those as three separate requirements. Storage can use only what remains after all three are accommodated.
Items to include in the cupboard layout
- The underbench unit or units and their access panels.
- Required ventilation routes and unobstructed clearances.
- Filter removal space and room to operate controls.
- Water isolation and electrical access.
- Tubing routes between the dispenser and equipment.
- Any retained bins, drawers or cleaning-product storage.
A scaled sketch is often enough to expose an obvious conflict. Where the fit is tight, ask for an installer assessment rather than relying on a cardboard box representing only the appliance body.
Check ventilation for the exact cooling system
Underbench equipment must dispose of heat in the way its manufacturer intends. Depending on the model, cabinet ventilation details may include air gaps, grilles, ducting or other specified arrangements. Do not assume that leaving a little room beside the unit satisfies every system.
The current Billi Home BC Installation Guide requires adequate cross-ventilation and warns that insufficient ventilation can impair refrigeration operation and increase power use. That is a model-specific requirement worth checking against the retained cabinet before purchase. Other systems need their own documented assessment.
Ask the installer to show the air path, including how air enters and leaves when the cupboard doors are closed. A ventilation opening hidden behind a packed bin system may have little practical value. The layout should remain workable under ordinary household use.
If a grille is needed in a door, side panel or kickboard, agree on its appearance and position. Cutting a finished panel after delivery can create a visible change that was absent from the original product discussion. Check whether matching replacement panels are available if the design later changes.
Account for nearby heat sources
A dishwasher, oven or sun-exposed cabinet can affect the conditions around the equipment. Have the installer consider the actual location and the manufacturer’s permitted environment. Avoid moving the unit into an adjacent cupboard solely to free storage without reassessing ventilation and tubing routes.
Ask about operating noise too. Fans and refrigeration components may be audible in a quiet open-plan room. A demonstration can help set expectations, but do not block ventilation or enclose equipment more tightly in an attempt to silence it.
Choose the dispenser position from above and below
At bench level, check reach, vessel clearance and the relationship to the sink. Below the bench, confirm that the mounting hardware and tubing will clear the sink bowl and cabinet rails. A position that looks balanced above can be inaccessible underneath.
If the dispenser will sit away from the sink, identify the compatible collection or drainage arrangement. A dedicated font may require another opening and a suitable waste connection. Include those components in the layout and budget rather than treating the tap as a freestanding bench accessory.
Review nearby window sashes, splashbacks and overhead cabinets. A tall tap can obstruct a window or make cleaning behind it awkward. Controls also need room for the intended hand movement, particularly where a safety action occurs behind or beside the dispenser.
Use the actual manufacturer’s template and have the installer confirm the final position before any cutting. Benchtop material, thickness, existing holes and proximity to edges all need appropriate assessment. Stone or other hazardous-dust-producing materials require suitable professional handling and controls.
For more detail on this part of the project, see How to Choose a Kitchen Benchtop Material.
Decide what happens to the existing mixer
A separate drinking-water dispenser can preserve a serviceable mixer but adds another fixture around the sink. An integrated tap may simplify the appearance while changing more of the plumbing. Compare everyday operation as well as the number of visible fittings.
If an old hole becomes redundant, agree on its treatment. A cover may be acceptable, but it should be a deliberate finish decision. Do not assume that a new tap base will conceal every previous opening.
Have the water supply assessed before installation
A licensed plumber should confirm the suitable supply connection, pressure conditions, isolation arrangement and any required protection for the selected appliance. The presence of cold water beneath the sink does not establish that the existing fittings meet the new system’s requirements.
Ask the plumber to review the installation manual and applicable local requirements together. Some protection may be incorporated within the appliance, while other arrangements depend on the model and site. Adding generic components without checking the specified system can be inappropriate.
Keep the isolation valve accessible after installation. A valve behind a fixed appliance or tightly packed waste plumbing may be difficult to reach when needed. The handover should show the homeowner its location and the approved response to a leak or service issue.
Water quality also matters. Tell the supplier if the home uses rainwater, bore water or another supply with particular treatment needs. A drinking-water filter should not be assumed to make an unknown or microbiologically unsafe supply suitable without an appropriate assessment.
Plan the electrical supply as part of the kitchen
Have a licensed electrician assess the appliance requirements and existing kitchen circuits. An unused socket does not prove that the circuit arrangement is suitable, especially where the cupboard already serves a dishwasher or waste-disposal unit.
The Billi Home BC guide specifies a suitable protected outlet and cautions against using a powerboard or double adaptor for that appliance. Follow the selected product’s requirements rather than improvising a shared connection to avoid electrical work.
Position the outlet and cord route so the equipment can be isolated and serviced as required. Keep them clear of moving bins and drawers. The installer should also avoid trapping the cord when the unit is moved into its final position.
If electrical work is planned elsewhere in the kitchen, coordinate this addition before final fit-off. Providing a suitable supply during open-wall work may be easier than returning after cabinetry and splashbacks are complete.
Make filter changes possible without dismantling the kitchen
Ask the supplier to demonstrate the filter replacement movement for the exact unit. Some cartridges need clearance below or in front; others are accessed through a panel. A filter that can be seen is not necessarily a filter that can be removed.
Check what must be taken out of the cupboard during maintenance. Removing a loose cleaning bucket is manageable. Unbolting a bin frame, disconnecting a waste pipe or moving the main unit every time may be an avoidable inconvenience.
Obtain the recommended maintenance schedule for the selected system and water conditions. Include filter costs, any professional servicing and the procedure after extended non-use. Keep replacement cartridge identification with the appliance records.
Zip’s HydroTap product information identifies regular filter changes and maintenance as part of ownership. Treat those tasks as ongoing requirements when comparing the tap with simpler drinking-water arrangements, rather than looking only at the purchase price.
Protect the service space from storage creep
Once installed, the cupboard will gradually attract bottles, cloths and spare kitchen items. Use a clear storage boundary or removable organiser that preserves the specified air and service spaces. Avoid a layout that relies on every household member remembering an invisible clearance.
Check cleaning access beneath and around the unit. A retained sink cupboard may already have water damage or difficult corners. Repair those conditions before fitting equipment that makes them harder to inspect.
For more detail on this part of the project, see Can You Keep Cabinets After Water Damage?.
Review boiling-water controls with the household
Try the dispenser’s safety action before purchase where possible. It should be understandable for intended users while providing the protection specified by the manufacturer. Consider dexterity, vision and the way a person will support a vessel during filling.
Do not disable a safety feature to make operation easier. If the control is unsuitable, ask about a different supported dispenser or arrangement. Household supervision and safe placement remain relevant even where a product includes a boiling-water lock.
At commissioning, have the installer explain normal indications, temperature settings and the approved response to unusual discharge or faults. The homeowner should not need to experiment with concealed valves or internal adjustments to understand normal operation.
Compare the installed cost and the storage trade-off
Request a complete scope covering the appliance, dispenser, accessories, benchtop work, cabinet modifications, plumbing, electrical work and commissioning. Identify any work that must be completed before the appliance installer arrives.
As a verified product-price reference checked in September 2026, Zip listed the HydroTap G5 BC Classic Plus Chrome at A$6,345 including GST. That is a specific manufacturer’s advertised retail price in AUD, not an installed market average. Confirm current pricing and inclusions when ordering.
Zip’s certified-installation information also states conditions and exclusions, including major plumbing modifications. This illustrates why an installation package should be read alongside the actual site requirements. Existing power and water, benchtop preparation and cupboard suitability can determine whether additional work is needed.
Put a value on lost storage as well. In a hypothetical compact kitchen, installing a boiling and chilled unit displaces the existing pull-out bin. Moving the bin into the only nearby drawer bank creates more inconvenience than removing the kettle saves. The household chooses a different arrangement after reviewing the complete layout.
Confirm readiness before the installation appointment
Have the installer confirm that the cupboard, services and dispenser opening are ready. Keep the exact model information available to all trades. A late product substitution can change dimensions, ventilation or supply requirements even when the tap looks similar.
At handover, check normal dispensing, safety controls, settings and the maintenance access demonstration. Record where isolation is located and whom to contact for service. Have any leak checks and commissioning completed by the installer before refilling the cupboard.
The retrofit is successful when the equipment has a permanent, workable home beneath the bench. Comfortable filling above, clear ventilation below and straightforward filter access together determine whether the new tap remains a convenience.