There’s a moment every visitor to Bath has — stepping off the street and catching that first waft of mineral-rich steam rising off the King’s Bath. It is an experience that dates back more than two millennia, and yet currently, it represents one of the fastest-growing sectors of the international travel market. As per the MarketIntelo report, the global thermal bath tourism market at $94.2 billion in 2025, poised to grow to $178.4 billion in 2034, registering a CAGR of 7.8%. For a city built literally on top of Britain’s only natural hot springs, that’s not a distant trend to watch. It’s a forecast for the high street.

The Numbers Behind the Momentum

It is easier to understand the extent of this growth if you look at it from the reverse angle. In 2019, the industry had revenues of about $61.2 billion, which grew up to $83.5 billion in 2023 and is set to more than double in the coming decade. Wellness-oriented thermal baths tourism, where the main aim of traveling is stress-relieving and sleeping well rather than treating any particular disease, is the biggest chunk of it, making up to 42% of all the revenue and growing faster than an average pace of development in the industry. Medical thermal tourism, when people visit countries for the sake of their healing from such diseases as arthritis, psoriasis, or cardiovascular disorders, is the smallest in volume, but its growth rate is the highest among all segments due to a number of studies concerning mineral-water therapy published in peer-reviewed journals.

Europe accounts for about 31% of the industry revenues in thermal tourism and comes second after Asia-Pacific, and it is considered the homeland of thermal tourism because of the history of bathing since Roman baths in Britain through Central European spa resorts and up to Mediterranean hammams. Within Europe, well-known thermal anchors illustrate just how much value a single destination can generate: Budapest’s Széchenyi and Gellért baths draw a combined 2.2 million international visitors a year, while Iceland’s Blue Lagoon — the highest-grossing single thermal facility in the world — generates an estimated $480 million annually from around 1.3 million visitors.

For Bath, this isn’t an abstract statistic to file away. It’s a description of the city’s own position on that global map.

Where Bath Fits on the Global Thermal Map

Few destinations anywhere in the world can claim what Bath can: naturally warm mineral waters that have drawn bathers since pre-Roman times, still flowing today into modern facilities and heritage sites alike. Analysts studying this industry have cited Thermae Bath Spa in particular as one of the leading boutique players within the segment, earning an annual income of about $78 million from a clientele numbering around 340,000 each year. It is not the visitor numbers which are relatively low compared to the behemoths like Budapest and Reykjavik but rather the revenue generated per visitor, which comes to a hefty $229 each day, that is exceptional here, with Bath being described as commanding the highest daily spend per visitor in any of the leading thermal destinations in the world.

This high-end positioning aligns well with three key trends that industry analysts have identified:

• Heritage as a differentiator, not a backdrop. Research consistently finds that wellness travellers are moving away from generic hotel spa menus toward destinations with a genuine geological and historical story — precisely the value proposition Bath has held, largely unchallenged, for two millennia.
• Rising average daily rates. Across tier-one thermal destinations, accommodation rates tied to thermal facilities have been climbing sharply in recent years, and properties adjacent to established thermal sites are reported to command price premiums of 28–35% over comparable non-thermal urban hotels — a dynamic already visible in Bath’s own hotel pricing.
• Extended stay economics. Thermal tourists globally are recorded staying an average of around 4.2 nights, notably longer than the 2.8-night average for general leisure travel — a pattern well suited to Bath’s positioning as both a short-break destination and a base for exploring the wider South West.

Growth Factors Shaping the Wider Industry

Several forces recur across current analysis of thermal and mineral-water tourism, and each has a direct read-through for Bath’s hospitality economy:

• Clinical legitimisation of wellness claims. Hundreds of peer-reviewed studies now document measurable benefits from mineral-rich thermal water — including improvements in skin conditions, joint mobility and cardiovascular function — and this evidence base is increasingly the foundation of destination marketing rather than a footnote to it. Operators able to point to genuine, tested water chemistry, as Bath can, are positioned to benefit disproportionately from this shift.
• A reversal in visitor motivation. Data suggests a majority of thermal bath visitors now cite health improvement, rather than leisure or pampering, as their primary reason for travelling — a significant shift from a decade ago, when the ratio ran the other way. This is pushing operators toward evidence-based messaging around sleep, recovery and stress regulation.
• Luxury hospitality investment. Major international hotel groups have opened dozens of new thermal-focused properties globally in the past few years, with dozens more in the pipeline, and these premium properties are reported to run at significantly higher profit margins than mid-range thermal facilities — a signal that investor confidence in the category remains strong.
• Digital-first booking behaviour. Online bookings for thermal tourism have grown substantially as a share of total transactions over the past several years, with direct hotel and spa websites now competing hard against large online travel agencies for a slice of that growth — rewarding independent operators, including those in Bath, who invest in their own booking technology and personalised offers.
• Regulatory and environmental scrutiny. As global visitor numbers rise, several established thermal destinations have reported measurable declines in spring temperature or flow linked to over-extraction, prompting tighter permitting rules in some regions. For long-regulated historic sites like Bath, where water flow and heritage protections are already tightly managed, this growing regulatory focus elsewhere in the industry reinforces rather than threatens the destination’s credibility.
• Corporate and longevity wellness spending. Only a modest share of corporate wellness budgets currently go toward thermal retreats, despite documented productivity and team-cohesion benefits — suggesting meaningful headroom for growth as employers expand wellness benefits. Separately, the broader “longevity tourism” category, focused on healthy ageing rather than illness treatment, remains in its early stages relative to its scale, pointing to further upside for destinations positioned around genuine therapeutic credentials.

Implications for Bath’s Hospitality and Tourism Industry

For the locals, it would be less about trying to jump on a bandwagon and more about refining an already existing story. The facts indicate that the thermal tourists who have the highest value do not necessarily represent the biggest number – they are the one paying the premium prices for authenticity, staying longer, and science-based wellness promises, which are areas where Bath already has an advantage in comparison to new thermal resorts created specifically for these tourists. The refinement of direct booking system, development of short-stay products targeting the two to three night tourists, and developing business ties between accommodation suppliers and thermal attractions of Bath will be the key leverage for making it happen.

As thermal bath tourism heads toward that 7.8% growth trajectory and a near-doubling in value by 2034, the destinations set to benefit most won’t necessarily be the newest or the largest. Judging by the data, they’ll be the ones — like Bath — that never stopped being the real thing.

Reference: https://marketintelo.com/report/thermal-bath-tourism-market