Trade Guide - Install 3-in-1 hot-water tap & tank

🔧 Scope of Works

• Isolate hot & cold supplies, depressurise and remove any existing tap/pipework.

• Enlarge or clean sink/work-top hole (if the new mono-bloc needs a 35 mm opening).

• Position and secure the 3-in-1 boiling-water tap with new seals and fixing kit.

• Site the insulated under-sink boiler/tank (typically needs ≈ 35 × 35 × 50 cm clear space and 230 V socket) and mount the carbon/scale filter. 

• Connect cold mains feed, return/hot feed and filtered boiling line using braided hoses supplied.

• Install or certify a 13 A fused spur/plug outlet on its own circuit (NICEIC-registered electrician, if not already present).

• Flush, calibrate temperature, set child-lock, and test flow/pressure for all three water functions.

• Demonstrate filter-change procedure and leave operating manual.

• Remove packaging/old fittings and tidy the work area.

---

💷 Typical Cost (incl. VAT, 2025)

Charge type	Low £	High £	Notes
Call-out / minimum	70	150	Plumber first-hour attendance bands
Labour per hour	50	90	UK average £50; London/emergency up to ~£90
Materials (tap + tank kit)	1,100	1,800	Quooker PRO3 Fusion £1,099; Grohe Red Duo £1,560; Quooker range £1,050–£2,420
Disposal	0	25	Cardboard & small metal – often free, some charge for WEEE.
Extras (electrical spur, filter upgrades, cabinet vents)	100	250	13 A spur £100–£200; Grohe fixed-price install £250; Quooker install £99
TOTAL (most jobs come in here)	1,400	2,300	Typical single-visit fit including mid-range kit and fused spur.

---

🕓 Time on Site

2½ – 4 hours for a straightforward swap into a clear cupboard with an existing spur.

Allow up to half a day if:

• No socket/fused spur exists and an electrician is needed.

• Cabinet panels require cutting for ventilation or extra clearance.

• Mains pressure regulation or scale-reducer is added.

• Old tap fixings are corroded or the sink hole needs enlarging. 

---

❓Questions to Ask Your Tradie

1. Are you NICEIC-registered (or will you bring an electrician) to connect the 230 V spur safely?

2. Is the quote labour-only or does it include the tap, tank, filter and any valves?

3. What clearance do you need under the sink and will you cut/vent the unit if space is tight?

4. Does your price cover the scale-filter cartridge and how often will it need replacing?

5. How long are the manufacturer & workmanship warranties, and who handles future servicing?

6. Will you register the product for warranty and provide the Building Reg compliance certificate (if required for an unvented appliance)?

7. Is disposal of packaging and demonstration of safety features included?

---

✅ How to Avoid Surprises

• Measure the cupboard: ensure ~ 35 × 35 × 50 cm free and leave rear ventilation.

• Check power: a dedicated 13 A fused spur within 1 m of the tank saves time and money.

• Water pressure: confirm you’re within the 1–7 bar range or budget for a pressure-reducing valve.

• Clear the under-sink area and arrange easy parking/permit for the installer’s van.

• Advise of solid-surface sinks/work-tops (granite, Corian) that may need specialist drilling.

• Keep first year’s filter cartridge on site so the plumber can fit and flush it during install.

 💡 With these details you’ll know exactly what the installer should do, what it’s likely to cost, and how to keep your 3-in-1 hot-water tap project running smoothly and on budget.