Surface water — where debris collects — drawn over a debris basket, then through paper cartridge filtration. Stainless steel mesh upgrade coming free of charge.
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Introducing the SUPA Spa Forge Core.
The commercial-grade hot tub, engineered for the home.
Heat from cold in just 60–90 minutes. Heated using propane gas. Plug and play on a standard 13A socket. No rewire. No electrician. No compromise.
No 24/7 heating costs, just rapid heat when you’re ready for a soak
Save over 70% on annual heating costs vs. constant-on electric spas.
60–90 min
From cold to 40°C
29 kW
Integrated propane
70%
Avg. annual saving
Finance & warranty
£6,995 inc. VAT, and delivery.
Or £201.59 a month.
Finance makes the Forge Core accessible to homeowners upgrading their garden without the full capital outlay upfront. Spread the cost over 24 or 36 months and enjoy a next generation spa.
Pay in full
One-time payment
Standard order
£6,995
inc. VAT & kerbside delivery
- Deposit at order 50%
- Balance Pre-shipment
- Total cost £6,995
- Saving vs. 36 mo. £961.98
Most popular
24-month finance
9.90% APR · UK only
£288.98/mo
Total payable £7,635.24
- Deposit £699.50
- Balance financed £6,295.50
- Monthly payment £288.98
- Term 24 months
Lowest monthly
36-month finance
9.90% APR · UK only
£201.59/mo
Total payable £7,956.98
- Deposit £699.50
- Balance financed £6,295.50
- Monthly payment £201.59
- Term 36 months
A hot tub, not a warm tub.
Most hot tubs run on a 2–3 kW electric heater that never stops. It keeps topping up the heat your tub loses through the walls, the cover, and the water surface — whether you're in it or not.
That constant background heating is what costs you £573 a year on average. SUPA replaces it with a 31 kW propane heater that only runs when you need it.
Did you know
For every 1°C of temperature your hot tub loses and replaces, you're paying roughly £0.36 — day and night, week after week, even when nobody's using it.
£573
/yr
Average annual saving reported by SUPA Heater owners vs. constant-on electric tubs.
SUPA Owner Survey
93
%
Of SUPA owners rate their heater a flawless 5 out of 5.
SUPA Owner Survey
96
%
Would already recommend SUPA to a friend or neighbour.
SUPA Owner Survey
~£5.00
To heat the full tub from cold. Then £1.00/hr to hold temperature.
Based on 47kg tank @ £95
The maths nobody talks about
Plug-and-play hot tubs can't do the job.
A standard 13A plug delivers a theoretical maximum of 2.86 kWh. Inside a hot tub, that ceiling is shared between heater, recirculation pump, jet pump and control system. The heating element itself is typically 2 to 2.2 kW.
Lifting 1,000 litres of winter mains water from 7°C to a BISHTA- compliant 40°C requires 38.4 kWh of net energy input. That's the physics. Nothing changes it.
Heating System
Power
Heat-Up Time
From Cold
13A plug
2.86 kW
13h 25m
Overnight
25A circuit
6 kW
6h 24m
Slow
Air-source heat pump
COP 7
5h 29m
Slow
SUPA Forge Core
29 kW
~1 hour
Yes
Fig. 1 · Time to heat 1,000 L by 33°C. Source: SUPA Intelligence.
One control interface. Four stages. Zero wasted energy.
Stage 01
Skimmer filtration
Stage 02
Mode 1 — Rapid heat
Filtered water passes into the SUPA Heater. The full 29kW output heats the water until target temperature is reached.
Stage 03
Jet mix at 38°C
Quick blast of the jets mixes the water body and ensures a uniform temperature reading before transition to Mode 2.
Stage 04
Constant Temperature
1.1°C drop triggers the heater to add in 5–6°C. The heater cuts out when set temperature is reached, then cycles to hold the set temperature for as long as you're in the spa.
Run the numbers
Built Better · Heats Smarter · Costs Less
How long. How much. Calculate before you buy.
Adjust the sliders. Watch the maths update live. This is what it will actually cost to heat your Forge Core, from whatever temperature you're starting at.
Calculations use the proven 1 kg propane = 12.5 kWh conversion and the 31 kW SUPA Heater output. The same physics that runs in your tub.
Time to heat
53min
Propane used
2.07kg
Cost · 19kg tank @ £47
£5.11
Cost · 47kg tank @ £95
£4.18
Specifications
Built Right. Engineered to Last.
Every dimension, every component, every figure — designed for reliability and all weathers, for peace of mind.
External diameter
201 cm
Height
100 cm
Water volume
1,150 L
Capacity
5 comfortable
/ 6 maximumWater jets
12 total
varying sizesExterior
Wood Plastic Composite
no treatment requiredHeating output
29kW
integrated propane-powered SUPA HeaterHeat time (cold)
60-90 mins
dependent on start tempHeat time (15°C → 40°C)
~80 mins
Power supply
13A standard plug
no rewireWarranty
5 / 2 yrs
acrylic liner and WPC exterior / mechanicalLead time
approx 6 weeks
from depositBuilt Better. Heats Smarter. Costs Less.
Configure your Forge Core
Twenty-one combinations.
One Forge Core, configured your way.
Three exterior cladding finishes. Seven interior liners.
3
EXTERIORS
×
7
LINERS
=
21
COMBINATIONS
STEP 01 · OUTSIDE
Three exteriors.One you'll love.
Wood Plastic Composite as standard. No treatment, ever. Pick the finish that fits your garden — and still fits it in ten years' time.
Pale GreyWPC · 01
The signature finish. Cool, contemporary and weather-proof — sits well against most garden palettes.
AnthraciteWPC · 02
Deep, architectural and formal. For a more dramatic garden or a luxury front-of-house.
BrownWPC · 03
The warmth of timber, without the upkeep. The choice for a more natural setting.
WPC — what you get
- No staining, oiling or annual treatment
- Resistant to moisture, UV and frost
- High quality appearance
- Lower lifetime maintenance cost
- Ideal for low-maintenance garden installations
vs. Thermowood
- Requires periodic treatment to maintain appearance
- Loses colour and finish due to varying weather conditions
- Untreated thermowood greys over time
- Higher ongoing cost of ownership
- More upkeep across the seasons
STEP 02 · INSIDE
Seven finishes.One you'll want.
Fibreglass-reinforced acrylic shell. Every liner is the same construction — the colour is the only thing that changes.
Jet configuration
The jet plan.
Most hot tubs sell on jet count. Forty. Sixty. Some claim a hundred. The number sounds impressive — until you understand the physics. One pump, divided across forty jets, delivers a dribble at every outlet. The Forge Core takes the opposite view: fewer jets, properly powered, properly placed.
A typical 40-jet hot tub
Full power ÷ 40 jets
= 2.5% per jet
Soft. Decorative. A dribble.
vs.
Supa Forge Core
Full power ÷ 12 jets
= 8.3% per jet
Hydrotherapy. Where the body wants it.
Supa Spa · Top view
Supa Spa · Jet configuration
Small water jetsTargeted pressure for neck, shoulder and upper-back positions.
7Jets
Medium · 3.5"Broad-pressure jets for lower back, thigh and calf.
3Jets
Large · 5"High-volume jets for deep muscle relief at the lounger seat.
2Jets
All jets are power-adjustable, directional and individually replaceable. Tune your bathe. Replace any jet that wears, without replacing the spa.
What's included
Everything you need. Nothing you don't. Just add gas.
Every Forge Core arrives complete. No upsells. No surprises.
Spa & Structure
Fibreglass-reinforced EU sourced acrylic spa shell
WPC exterior cladding — no treatment required
Insulated spa shell
Steps with handrail
SUPA Heater Cabinet
Cover and cover lifter
12 water jets — 3 sizes, power-adjustable, directional
7-colour LED light
Heating & Equipment
SUPA Heater (29 kWh propane)
Hoses and connections
Propane gas regulator with safety valve
Recirculation pump
Skimmer filter (2 x paper type at delivery)
5 m RCD extension lead (13A plug & play)
Delivery
Kerbside delivery included. Six weeks from deposit.
Plan your delivery access route in advance. The closer the vehicle gets to final position, the easier the move.
Spa weight~250 kg · 3–4 people to lift
Base requirementSolid, level · min 220 cm Ø · 2,000 kg
Cover lifter clearance90 cm beyond base diameter
Power supplyStandard 13A socket · plug and play
Included5 m in-line RCD extension lead
Gas connectionPropane regulator kit · safety valve · included
Reserve yours · Six-week lead time
One hot tub. Built better. Heats smarter. Costs less.
£6,995 inc. VAT and kerbside delivery. Finance from £201.59/month.