Product Description
A round hot tub sized to your group
The Nordic Flex is the round polypropylene hot tub you size to the people who will actually use it. There are five diameters, from 1,400 mm for two to four people to 2,200 mm for a group of up to twelve. Every size has the same 1,040 mm height and the same choice of cladding, heating and equipment, so you can choose the size first and build the rest around it.
The shell is moulded polypropylene in one of five colours (white, black, blue, light grey or dark grey). It is smooth, non-porous and quick to wipe clean, and unlike an all-wood tub it never needs soaking or sealing. The outside is clad in the wood or composite you pick, and the benches inside are shaped to the curve of the tub.
Five sizes at a glance
| Internal diameter | Bathers | Water volume | External diameter (top / base) | Height |
|---|---|---|---|---|
| 1,400 mm | 2–4 | About 1,380 litres | 1,720 / 1,440 mm | 1,040 mm |
| 1,600 mm | 4–6 | About 1,800 litres | 1,920 / 1,640 mm | 1,040 mm |
| 1,800 mm | 6–8 | About 2,280 litres | 2,120 / 1,840 mm | 1,040 mm |
| 2,000 mm | 8–10 | About 2,800 litres | 2,320 / 2,040 mm | 1,040 mm |
| 2,200 mm | 10–12 | About 3,400 litres | 2,520 / 2,240 mm | 1,040 mm |
Each tub is made by hand, so treat these as close guides and check any tight gate, recess or lifting measurement against the drawing that comes with your order. A practical rule: choose the size for the group you host most often, not the largest group you can imagine. A smaller tub heats faster and costs less to run on an ordinary weeknight.
Choose the cladding
Six finishes are available in every size. Spruce is light and classic. Larch is denser and naturally more weather resistant. Thermowood is heat-treated for stability and a warm, even colour. Oak is the most solid and the most premium. WPC composite in black or brown looks crisp and modern and never needs oiling.
The wooden round top edge and wooden lid are made in spruce or Thermowood, so they are offered with those two claddings. With larch, oak or WPC the tub takes the polypropylene top edge, which the selector adds for you.
Choose how you heat it
The heating choice decides how the tub fits into your evenings: how long you wait, what fuel you buy and how much of the inside the stove takes up. The Flex is offered with fourteen setups.
| Heating | Where it sits | Good to know |
|---|---|---|
| External wood fired stove (AISI 316; 22 kW up to 1,800 mm, 28 kW at 2,000 mm, 40 kW at 2,200 mm) | Beside the tub | Keeps the full circle free for bathers; needs a little space next to the tub. |
| Internal wood fired stove (AISI 316) | Inside the tub | A compact setup with no separate heater outside; takes up some seating space. |
| Integrated wood fired stove (AISI 316) | Inside the tub | Built in as part of the tub, with nothing standing outside; takes up some seating space. |
| Electric heater 6 kW (WiFi-ready – WiFi module available as an add-on) | Technical unit | No firewood and no smoke; can be scheduled from your phone with the Smart kit. |
| Hybrid: electric 6 kW + external, internal or integrated wood stove | Both | Light the stove for a fast first heat, then let the electric heater hold the temperature. |
| Hybrid: 5 kW Wi-Fi heat pump + external, internal or integrated wood stove | Both | The heat pump keeps the water warm efficiently and can cool it in summer; the stove adds quick heat. |
| External pellet fired stove (AISI 316, 30 kW, Wi-Fi) | Beside the tub | Wood heat with automatic feeding and app control. |
| Gas heater | Beside the tub | Fast, clean heating where gas is available. |
| Bioheater (Wi-Fi) | Beside the tub | Supplied with connections and a circulation pump. |
| Connections for your own heater (50 mm) with closing valves | – | For a heater you already own or plan to add later. |
No fixed heating time can be promised: it depends on the size you choose, the starting water temperature, the weather and the heater. With electric heating, the standard 6 kW heater runs on single-phase 220 V, which suits most UK homes, or on three-phase 380 V. Higher outputs of 9, 12 and 15 kW need three-phase. A qualified electrician should confirm the cable and protection. If you need a combination that is not listed, contact us.
Benches, stairs and lid
Choose one or more bench styles: classic wooden benches, shaped “sunny type” wooden benches, or polypropylene benches in an open or closed version. Wooden benches are always made of spruce, whatever the cladding. Closed polypropylene benches form a continuous seat and fill some of the volume below it, which can cut the water you heat and treat by around a quarter in the larger sizes.
For getting in and out, pick a simple three-step ladder or the B, A or C type stairs – one type or several. For the top, every tub has one edge: the wooden round edge or the polypropylene edge. On top of that you can add the wooden lid, the insulated leather lid or both. The leather lid holds the heat between sessions and has a cut-out when the stove sits inside the tub.
Insulation, massage, light and Wi-Fi control
Wall and floor insulation are worth adding if you bathe through the winter, because they keep the water warm for longer and reduce the fuel or power needed to reheat it. Floor insulation adds about 70 mm to the height, and wall insulation about 160 mm to the base diameter.
- Air bubble massage for a soft, all-over effervescence.
- Hydro massage jets for a firmer, targeted massage.
- Sand filtration in a large wooden cover box, so the water stays clear for longer between changes.
- 2 or 4 LED lights; four are recommended for the 1,800–2,200 mm sizes.
- Smart kits to run the massage, the filter or the electric heater from your phone over Wi-Fi.
With a wood fired stove you can also add an ash shovel and rake, a metal fence on the chimney for burn protection, and, with the internal or integrated stove, a stainless steel lid for the heater.
Before delivery: base, drainage and access
Plan the base for the full weight in use: the tub, the water, the bathers and the equipment. The 2,200 mm size alone holds about 3,400 litres, so the surface must be level, firm and designed for that load. Leave room for the stairs, the lid when it is open and, if you choose one, the external heater.
Drain the tub through an external tap, or add a quick adapter for a 12.5 or 15 mm garden hose. The tub is delivered by lorry to the delivery zone you choose in the selector. Check that the route from the road to the base is clear and plan how the tub will be moved from the unloading point to its final position.
Is the Nordic Flex right for you?
Choose the Flex if you want a round tub that matches your household exactly: the right size for your group, the cladding that suits your garden and the heating that suits how often you bathe. It works as a simple wood fired family tub or as a fully equipped, app-controlled spa. If you mostly bathe as a couple, a smaller two-person tub will heat faster and take less space.
Frequently asked questions
Your selected configuration, final drawing and order confirmation describe the tub you receive.
Which size should I choose?
1,400 mm suits 2–4 people (about 1,380 litres), 1,600 mm 4–6 (about 1,800 litres), 1,800 mm 6–8 (2,280 litres), 2,000 mm 8–10 (2,800 litres) and 2,200 mm 10–12 (3,400 litres). Choose for the group you host most often.
Can I have it without a heater?
Yes. Choose “Connections for your own heater (50 mm) with closing valves” and connect a heater you already own or add one later.
Internal, integrated or external stove?
The external stove keeps the whole tub free for bathers but needs space beside it. The internal and integrated stoves heat from inside the tub with nothing standing outside, and take up some seating space.
Which electric connection do I need?
The standard 6 kW heater works on single-phase 220 V (26 A), recommended for most UK homes, or three-phase 380 V (14 A). The 9, 12 and 15 kW heaters need three-phase. Ask your electrician to confirm cable and protection.
What is the difference between the claddings?
Spruce is light and classic, larch denser and more weather resistant, Thermowood heat-treated and stable, oak the most solid. WPC in black or brown needs no oiling.
Which lid should I choose?
Every tub needs one edge. With larch, oak or WPC cladding that is the polypropylene edge. With spruce or Thermowood you can choose the polypropylene edge or the wooden round edge. Then add the wooden lid (spruce and Thermowood), the insulated leather lid, or both.
Open or closed polypropylene benches?
Open benches leave the space beneath free. Closed benches form a continuous seat and can reduce the water volume by around a quarter, so there is less water to heat and treat.
Can it cool the water in summer?
Yes, with the 5 kW heat pump hybrid. The heat pump heats or cools the water and is combined with a wood fired stove for fast heating.
What base do I need?
A level, firm surface designed for the tub, water, bathers and equipment. The largest size holds about 3,400 litres before people and accessories, so have the base checked for your exact configuration.
What warranty applies?
A 24-month manufacturer warranty from receipt, subject to the full terms, correct installation and use as described in the manuals supplied with your tub and equipment.
Dear TimberIN Team,
Many thanks to the whole team at TimberIN. We are really pleased with our wood burning hot tub. The delivery was on time and efficient, although I would stress to people taking delivery to ensure you have lots of friends to help move it and/or equipment on hand if it needs to go over a fence. We were 9 people in the end who manoeuvred the hot tub into position through a very tight gate hole and it was no easy job.
We had the tub up and running within hours and have been surprised how often we’re using it even after the initial honeymoon period.
The quality and craftsmanship are great and unlike other more conventional ‘plastic’ hot tubs we saw it really does look great. So far all members and ages of the family have enjoyed it, from our nephews splashing around over Christmas, to Grandma relaxing under the stars with a drink on hand in the ‘bar’.
We’re looking forward to many years of fun use to come!
Tom and Family
Review for TimberIN Nordic Flex™
★ ★ ★ ★ ★