Wellis Spa Installation Guide

This guide summarises the practical installation requirements for Wellis hot tubs, swim spas, and cold plunges, drawn from the Wellis user manuals and the CityLife / PeakLife / Classic Line / Wibespa / Iceland documentation. The exact requirements vary by model — the data plate on the side panel and the manual that ships with your spa are the authoritative source. Always check those first.

Before Your Spa Arrives — Site Checklist

Walking through this list before the delivery date prevents most installation issues we see at TwoRelax.

1. Final position decided, with at least 60 cm of clearance on every side for service access. The cabinet panels need to come off for routine maintenance — typically every 12–18 months.
2. Foundation in place — concrete pad, paving on a compacted base, or a deck certified by a structural engineer. See "Foundation" below.
3. Electrical supply terminated at the spa location by a qualified electrician (see "Electrical Requirements"). For plug-and-play models, the dedicated socket must be within 2 m. For hardwired models, the supply runs into the equipment cabinet.
4. Delivery access verified. Most Wellis hot tubs need a 90 cm clear gate / corridor; swim spas need 2.4 m. Crane delivery is available for tight access — book in advance.
5. Drainage planned for quarterly water changes. The 2-inch fast-drain valve empties most Wellis hot tubs in roughly 10 minutes.
6. Water source identified. A standard garden hose tap is sufficient. We recommend connecting through a Pure Fill charcoal prefilter (and a Pure Stream water softener if your tap water is hard).

Foundation Requirements

The filled weight of a Wellis spa depends on the model:

• Hot tubs: typically 1,000–2,000 kg filled (water + spa + 4–7 bathers).
• Iceland cold plunge: ~750 kg filled (single seat, 530 L water).
• Swim spas: 5,000–9,000 kg filled (Wellis Amazonas family is around 9,000 kg).

Recommended foundation

A reinforced concrete pad, minimum 100 mm thick, levelled to within ±5 mm and extending 100 mm beyond the spa footprint. This is the surface against which Wellis warrants the spa shell.

Acceptable alternatives

• Paving slabs on a compacted gravel and sand base, with the underlying soil verified to support the filled weight.
• Reinforced timber decking, only where a structural engineer has certified the deck for the live load including filled water and bathers.

Not suitable

• Grass, soil, gravel, or sand directly under the spa
• Loose paving stones with no compacted base
• Sloping concrete (more than ±5 mm fall over the footprint)
• Decks supporting the spa on individual corner blocks

Swim spa exception

The Wellis Amazonas, Danube, Rio Grande, Beach Club, and Elba swim spas are designed with reinforced fibreglass bases. The Wellis brochure specifically advertises "simple installation, no need for concreting" for these models — they can sit on a well-prepared compacted base. However, the underlying ground must still support 5,000–9,000 kg. A structural engineer review is recommended for any non-concrete base.

Electrical Requirements

Wellis spas are designed for European 230 V or 400 V supply. The minimum and recommended supply for each model is printed on the data plate and in the user manual. Below is the summary by spa range.

Plug & Play hot tubs

Mars, Castor, Callisto, Sevilla Plug & Play

• Power: 1 × 16 A / 230 V / 50 Hz, dedicated socket (Iceland: 1 × 10 A / 230 V)
• RCD/GFCI: 30 mA, dedicated to the spa circuit
• Cable: supplied by Wellis (typically 2 m H07RN-F)
• Concurrent operation: at the minimum 16 A supply, the heater and pumps may not run simultaneously. Upgrading to 1 × 25 A removes this limit and is recommended for daily use

Hardwired hot tubs

CityLife (Vienna, Lugano, Prague, Firenze, Manhattan, Budapest, Lima, Malaga, Palermo, Teide), PeakLife (Atlas, Olympus, Mandala, Makalu, Kilimanjaro, Everest, Elbrus), Holiday-Let (Cordoba, Valencia, Porto), Dabassy Edge Premier & Select, Wibe Avatar & Matrix

• Minimum: 1 × 16 A / 230 V (limited concurrent operation)
• Optimal: 1 × 32 A / 230 V or 3 × 16 A / 400 V (concurrent pump + heater operation)
• Cable: H07RN-F or equivalent rubber-sheathed flex, 5-core for 400 V or 3-core for 230 V, sized to the breaker rating and cable run length
• RCD: 30 mA Type B (Type A is insufficient for inverter pumps and modern heater electronics)
• Disconnect switch: lockable, within sight of the spa, accessible without entering the cabinet
• Earth bonding: mandatory PE conductor to the spa frame

Swim spas

Amazonas, Amazonas Grand Prix, Danube, Rio Grande, Beach Club, Elba

• Optimal: 1 × 50 A / 230 V or 3 × 16 A / 400 V (recommended for full performance)
• Minimum: 1 × 32 A / 230 V (limited concurrent pump + heater)
• 30 mA Type B RCD mandatory
• Lockable disconnect switch within sight of the swim spa
• Cable: sized to the higher current draw — typically 6 mm² 5-core for 400 V supplies

Standards compliance

The hardwired connection must comply with national electrical code:

• Germany: DIN VDE 0100-702 (Special installations: swimming pools and similar)
• Austria: ÖVE/ÖNORM E 8001-4-702
• United Kingdom: BS 7671 Part 7 Section 702
• EU more broadly: IEC 60364-7-702

Wellis will not honour the manufacturer warranty for damage caused by improper electrical installation.

Delivery & Positioning

• Access width: measure every gate, corridor, doorway, and gap between buildings on the path from the road to the final position. Hot tubs need 90 cm minimum; swim spas need 2.4 m.
• Orientation: position with the equipment cabinet (filter, pump, heater, control box) facing the most accessible side of the install location. The cabinet panel comes off for service.
• Cover lifter clearance: 80–100 cm behind the spa to allow the cover to fold backwards.
• Levelling: use the four adjustable feet (where supplied) to bring the spa to within ±5 mm. Verify with a spirit level on the rim before filling — filling an unlevelled spa stresses the shell and can cause shell cracks.

Filling the Spa

1. Connect the garden hose through the prefilter(s) — Pure Fill charcoal prefilter first, then the Pure Stream water softener if your tap water is hard (above 14 °dH).
2. Fill via the cartridge filter housing, not by hosing into the body of the tub. This primes the plumbing and prevents air locks in the circulation pump.
3. Fill to the level marked inside the filter housing — typically 50 mm above the filter top.
4. Do not power on the spa until the water is above the filter intake. Running the pumps and heater dry damages them within seconds and voids the warranty.

Typical filled volumes: hot tubs 800–1,500 L · Iceland cold plunge 530 L · Iceland Duo 1,130 L · swim spas 3,500–9,000 L.

First-Time Commissioning

Once the spa is filled and your electrician has signed off the electrical supply, switch on at the breaker.

First-hour checks

• The control panel (Easy4 / Easy7 / SmartTouch) lights up and displays the current water temperature.
• The circulation pump runs continuously. If you see any error code, consult the control system manual immediately.
• The heater engages — a typical Wellis spa reaches the target water temperature within 8 hours from a cold fill (faster with the optional 3 kW heat pump).
• No water visible at any plumbing connection — open the equipment cabinet panels and inspect.
• The thermal cover seals fully along the rim and the cover lifter operates smoothly.

Initial water-care setup

Run the circulation pump while doing each of these steps:

1. If your tap water has visible iron content (yellow / orange tint), add Crystal Metal Clear per the bottle dose.
2. Add Crystal Alkalinity Balancer to bring total alkalinity to 80–150 ppm.
3. Adjust pH to 7.2–7.8 with Crystal pH Down.
4. Add the sanitiser of your choice — chlorine tablets in a floating dispenser (most common), bromine via the in.Clear generator (if equipped), or active oxygen (chlorine-free option).
5. Test water with Crystal Pool Check 5-in-1 strips after the first heat cycle. Rebalance as needed.

For the full water-care routine, see the Wellis Water Care Guide.

When to Stop and Call Us

If you see any of these during installation or first commissioning, stop using the spa and contact TwoRelax customer support:

• Error codes on the control panel that don't clear after a power cycle
• Water visible under the spa or behind the cabinet panels
• Any burning smell or electrical odour
• The RCD trips repeatedly when the spa is powered on
• Pump or heater failing to engage after 30 minutes at the breaker
• Bowed or cracked acrylic shell — most often the result of filling an unlevelled spa

Important — Disclaimer & Legal

This page provides general installation guidance and does not replace the manufacturer's installation manual supplied with your specific Wellis model. Always follow the manual; if there is any difference, the manufacturer's manual takes priority.

All electrical work on a Wellis spa — particularly hardwired connections, RCD protection, disconnect switches, and earth bonding — must be carried out by a qualified electrician licensed in your country (DIN VDE / ÖVE / BS 7671 / equivalent). Improper installation voids the Wellis manufacturer warranty, creates risk of fire, electrocution, and equipment damage, and may breach building insurance terms.

For installations on terraces, balconies, decking, upper floors, or any non-ground-level surface, consult a qualified structural engineer before delivery. The filled weight of a Wellis spa frequently exceeds 1,500 kg and can exceed 9,000 kg for swim spas.

TwoRelax accepts no liability for damage, injury, equipment failure, or warranty loss arising from installation work performed by unqualified persons, deviation from the manufacturer's manual, inadequate foundation, or non-compliant electrical supply. If in doubt, stop and contact us before proceeding.