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Beta systems sales open soon

Use solar, heat pump and autonomous tech to power your hot tub for free

Save 93% on heating costs with a plug-and-play smart conversion kit that adds solar energy, battery storage and heat pump tech to heat your tub for free for ~270 days a year and heats for 95 days at a quater of the cost.

Register your interest See how it works
Fits
Lay-Z-Spa, CleverSpa, Canadian Spa, Wave Spa and Intex tubs
Use solar, heat pump and autonomous tech to power your hot tub for free
610W solar captured on-site
Heat pump to 40 °C
Retrofits your existing tub
Solar + battery + heat pump
App control & monitoring
Sealed, labelled, no wiring
Built & tested in Devon
The problem

Loved the idea, then dreaded the bill.

The pandemic put a hot tub in over a million UK gardens. Then energy prices turned a treat into a guilt-ridden luxury.

1.1M+

Foam & inflatable spas estimated to be installed across UK homes.

55%

of owners surveyed said they rarely or never use their tub with running cost the most-cited reason.

£30–£100+

a month is what many owners report spending to keep a tub warm year-round.

Figures drawn from widely reported UK industry estimates and owner surveys. Eco Hot Tubs is designed to remove 93% of the running cost on the tub you already own.

How it works

Sunlight in. Stored power. Efficient heat out.

The kit sits beside your tub as a self-contained energy unit. It captures solar, stores it, and drives an efficient heat pump autonomously falling back to mains only when it needs to meet your required use.

  1. 1

    Capture

    A 610W solar panel on a simple aluminium base plate harvests energy in your garden — no roof, no planning faff.

  2. 2

    Store

    A smart power box holds a hybrid inverter/MPPT and 2× LiFePO4 batteries, banking power for when you want to soak.

  3. 3

    Heat

    An inverter-driven heat pump moves heat into the water efficiently, targeting a comfortable 40 °C.

  4. 4

    Optimise

    Smart switching and the app balance solar, battery and mains, so the system uses free energy first and only mains after several especially dark days.

Transform your existing hot tub to save 93% of your heating costs
Conversation Kit

Transform your existing hot tub to save 93% of your heating costs

A Raspberry Pi-powered IoT system monitors and controls the batteries, inverter, automatic mains switchover, and heat pump keeping your tub hot regardless of solar conditions. The 610W solar panel covers spring-to-autumn heating almost entirely. In winter or prolonged cloudy spells, it seamlessly switches to mains with the heat pump still saving 75% of the running cost compared to a conventional hot tub heater.

Inverter, MPPT & battery in one sealed box
Smart power box

Inverter, MPPT & battery in one sealed box

A 24V hybrid inverter/MPPT paired with 2× 12.8V 100Ah LiFePO4 batteries — ventilated, enclosed and self-managed with fans for when its hot and battery warmers for when its cold.

Product packages

Pick the path that fits your garden.

All pricing below is target pricing while we finalise specification and compliance. Reserve your place and we'll confirm details before anything is due.

Lead product

Eco Conversion Kit

Add solar, storage and an efficient heat pump to the inflatable spa or hot tub you already own.

£2,495

Founder beta from ~£1,995 · limited first 10 systems

  • 610W solar panel + aluminium base plate
  • Smart power box (inverter/MPPT + batteries)
  • Inverter-driven heat pump & circulation pump
  • Pre-assembled, insulated pipe runs
  • App control & monitoring
Reserve a founder kit

Complete Eco Hot Tub System

The full system with a tub and liner included — a ready-to-go solar hot tub for new owners.

£2,995

Tub, liner & blower included

  • Everything in the Conversion Kit
  • Insulated tub & liner
  • Air blower for bubbles
  • Single set-up, fully matched parts
Register interest

Heat Pump + Connector Pack

An entry-level efficiency upgrade — swap resistive heating for an efficient heat pump.

£999

The most accessible way in

  • Inverter-driven heat pump
  • Circulation pump & insulated pipe runs
  • Labelled, plug-and-play connectors
  • Solar-ready — add the power box later
Register interest

Prices are target figures for planning only and are not an offer of sale. Final pricing, specification and any savings depend on your tub, setup and conditions.

Plug-and-play installation

You don't wire anything. Promise.

Every electrical box arrives sealed and tested. Connectors are labelled and keyed, so set-up is about matching the labels — not handling mains.

You don't wire anything. Promise.

  1. Sealed, tested boxes

    The power box and switching box are factory-sealed and pre-wired — no opening, no exposed mains.

  2. Labelled connectors

    Every plug and pipe is clearly labelled and keyed. Match label to label and it simply connects.

  3. Pre-assembled pipe runs

    Insulated pipe runs and the circulation pump come pre-built — just couple them to your tub.

  4. Pair the app & soak

    Power on, connect to the app, set your target temperature, and let the system take over.

Designed so the customer never touches the wiring. Sealed boxes, labelled connectors, and a circulation pump that's ready to run out of the carton.
Smart app & control

An app that's learning to think ahead.

Today you get live control and monitoring. The vision we're building toward is a system that anticipates the weather and spends free energy first.

Live power & tub status

See solar generation, battery state, heat-pump status and water temperature at a glance.

Remote control & scheduling

Set your target temperature and warm the tub for when you actually want it.

Weather-aware (in development)

The roadmap: predict solar generation from the forecast and pre-warm using surplus before cloud or cold arrive.

Learns your system (in development)

Designed to learn your tub's heat losses and the heat pump's efficiency, then balance battery against mains.

TuyaShellyRaspberry PiMPPTLiFePO4
An app that's learning to think ahead.

Prototype dashboard shown for illustration. It is a proof-of-principle and does not represent final, guaranteed savings.

Register your interest

Help shape the first systems.

We're inviting a small group of UK hot tub owners to register early. Send us your details and we'll be in touch with availability, specification and next steps — no payment now.

  • Founder pricing on the first limited systems
  • Direct line to the team building it in Devon
  • Early access to the app as features land
  • No obligation — register interest first

No payment now · UK only during beta · You can opt out anytime

FAQ & the small print

Honest answers while we build.

We're an early-stage startup. Here's what we can say confidently — and where we're being careful not to over-promise.

Our careful claims

  • Pricing is target pricing for planning, not a sale offer.

  • The kit is designed to reduce running costs — savings vary by tub and conditions.

  • The dashboard shown is a proof-of-principle prototype, not final live data.

  • Specification and compliance are being finalised ahead of launch.

  • We don't claim "zero cost" or fixed efficiency figures.

Will it work with my Lay-Z-Spa or inflatable spa?

Our initial focus is exactly that — existing inflatable spa and hot tub owners. The Conversion Kit is built to retrofit the tub you already own. Tell us your tub type when you enquire and we'll confirm fit.

Do I need to wire anything or hire an electrician?

No. The system is plug-and-play. Electrical boxes arrive sealed and tested, and connectors are labelled — you match labels rather than handle mains.

How much will it actually save me?

The system is designed to reduce running costs by using captured solar and an efficient heat pump in place of resistive heating. We're deliberately not quoting guaranteed savings — real figures depend on your tub, usage, location and the weather.

What's the difference between the kit and the complete system?

The Eco Conversion Kit upgrades a tub you already own. The Complete Eco Hot Tub System bundles the same energy system with a tub, liner and blower — ideal if you're starting from scratch.

Does registering my interest commit me to anything?

No. Registering your interest is free and non-binding — it simply puts you on the list to hear about availability, specification and founder pricing.