What to Tell Installers to Get an Accurate Backup Water Quote

Getting three quotes for a backup water system is good practice, but three vague quotes are not much better than one. Installers are pricing against unknowns when they lack basic information about your property — and unknowns translate into contingency margins or, worse, surprise extras after the job starts. This checklist gives you the specific details to share before anyone sets foot on your property, so the numbers you receive reflect your actual situation.

Why the Details You Share Matter So Much

Backup water systems — tanks, booster pumps, pressure vessels, pipework, and controls — are not off-the-shelf products bolted on in an afternoon. Every installation is shaped by your roof height, your existing reticulation, your municipality’s pressure, and how you actually lose water (planned outages, burst mains, load-shedding-related pump failures, or something else). An installer quoting without this information is essentially quessing. You can read more about the full range of system types on the backup water systems overview, which explains what each component does and why sizing matters.

The details below are organised in the order most installers find useful: property first, then usage, then the outage problem you are solving.

Property Details to Photograph and Measure

Number of storeys. A single-storey home fed directly from a tank often needs only a modest pump, if any. A double-storey — or a property with a granny flat above the main roof — needs more head pressure, which affects pump specification and cost.

Roof and eave height. If the tank will sit on the ground, the installer needs to calculate the pressure difference between the tank outlet and your highest tap or shower. If it will sit elevated on a stand or a roof platform, structural load becomes a factor.

Distance from the water meter to your intended tank position. Long pipe runs add material cost and may require a larger diameter pipe to maintain flow rate. Take a rough pace measurement and note any obstacles: boundary walls, established trees, paved surfaces that would need to be cut.

Existing infrastructure. Photograph your existing pressure-reducing valve (PRV), your main stopcock, and any current pump or pressure vessel if you have one. Snap the labels on your existing geyser and any irrigation controller. If your property already has a JoJo or similar tank, note its size and current connection method.

Access. Narrow side passages, low gates, or difficult terrain all affect installation time and crane or pump hire. A photograph of the access route saves everyone from surprises on the day.

Household and Usage Information

Installers use household size and daily habits primarily to size storage capacity. If your tank is too small, you run dry mid-outage; too large and you pay for capacity you never use.

• Number of permanent occupants, including any regular visitors or live-in staff.
• Approximate daily usage pattern — long showers, large garden irrigation, a pool auto-fill, a home laundry business, or livestock watering all push requirements up substantially.
• Whether you need the backup supply to feed the whole house or only critical points (kitchen, one bathroom, outside tap). A partial backup is simpler and cheaper than whole-house reticulation.
• Geyser type. A heat-pump or solar geyser may have different inlet-pressure requirements than a standard element geyser. Pressure-related damage to geysers is a known risk if backup pressure is poorly regulated.

Your Outage Pattern — the Most Overlooked Detail

This is the information homeowners most often leave out, and it has the biggest effect on system design.

Outage type	What the installer needs to know
Scheduled municipal maintenance	Typical duration, advance notice period
Burst main / emergency cuts	Approximate frequency in the past year
Load-shedding-related pump failure	Stage duration, overnight frequency
Pressure drops (water arrives but weakly)	Time of day, whether it is seasonal
Complete dry taps for days	Has this happened? Worst-case duration

Knowing whether you need four hours of autonomy or four days changes tank sizing, pump specification, and whether auto-fill controls or level sensors are worth including. Be honest about your worst experience, not just the typical one.

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Municipal Pressure and Connection Point

Ask your municipality or check your water account for your supply pressure if you can — or simply tell the installer whether your taps feel strong, weak, or inconsistent at different times of day. Municipal supply pressure directly affects whether a tank-fed gravity system will be adequate or whether a booster pump is essential.

Also clarify:

• Where your water meter is located and whether there is space beside or behind it for a by-pass or auto-fill connection.
• Whether your property has a borehole already connected or planned, because a combined borehole-and-tank system is quoted differently from a municipal-top-up-only setup.
• Whether your complex or estate has body-corporate rules about tank aesthetics, colours, or positioning. Some estates in greater Johannesburg require tanks to be screened or capped at a specific height. Installers who work locally often know this, but confirming it saves a redesign.

Questions to Ask the Installer — Before They Quote

Sharing information flows both ways. Use the initial contact to ask:

1. Are you registered with the NHBRC or a relevant industry body? For larger installations that include structural work, registration matters. The National Home Builders Registration Council (NHBRC) sets standards for work that forms part of a home’s structure.
2. Will the quote include the pressure-reducing valve if one is required? This small component is frequently left off initial quotes and added later.
3. What is and is not included in the warranty? A pump warranty from the manufacturer is different from a workmanship warranty from the installer.
4. Who handles the local authority notification or plumbing compliance certificate? Any modification to the potable water supply in South Africa should comply with local bylaws, and a registered plumber must certify the work.

Understanding how to compare water quotes once you have them is a separate skill — scope differences and exclusions matter as much as the headline price.

Sending It All Before the Visit

The most practical approach is to compile everything into a single message or email before any site visit is scheduled:

• Four to six photographs (street view, meter position, intended tank location, access route, any existing pump equipment)
• A brief paragraph covering household size, worst-case outage duration, and whether you need whole-house or partial backup
• Your approximate budget range, if you have one — this helps an installer propose a solution that fits rather than overbuild or undersell

Installers who receive this information can often provide a preliminary cost range within a day without visiting at all, which means the actual site visit becomes a confirmation rather than a discovery exercise. You are also in a stronger position to spot whether quotes are comparing the same scope — which is the most common reason three quotes look wildly different. For a practical guide on running that comparison fairly, see getting multiple quotes.

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A Note on Prices as a Sanity Check

As a rough guide using Johannesburg reference figures: backup tank-and-pump systems typically run R20,000–R40,000 for a basic installation, with whole-house setups around R55,000. These are Johannesburg figures — costs in your area may differ, and you should treat them only as a rough check that a quote is in a plausible range, not as a target to negotiate toward. An unusually low quote almost always means something has been excluded. An unusually high one may reflect a more complete scope — or simply a margin call. The only way to know is to compare quotes that cover identical scope, which is exactly what a detailed upfront briefing makes possible.