Which guidance should a hot tub operator follow: HSG282 or HSG274?
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Key points
- For a hot tub, HSG282 is the working document. It is the HSE guidance written specifically for spa-pool systems.
- HSG274 is the general framework behind it; you read HSG274 for context and HSG282 for operations.
- A hot tub in a holiday let is a commercial spa pool in the eyes of the guidance, even in a private garden.
- HSG282 demands a continuous, recorded regime: disinfection, pH control, testing, filter hygiene, and bather management, not occasional attention.
- The records matter as much as the chemistry: a hot tub's log book is the evidence the regime actually ran.
If you are responsible for a hot tub, in a holiday let, hotel, gym, or spa, HSG282 is the guidance you should actually be working from. HSG274 is the HSE's general technical guidance on legionella control across all water systems; HSG282 is the dedicated document for spa-pool systems, and it goes into the operational detail that a warm, aerated, recirculated tub demands. Read HSG274 for the framework, HSG282 for the daily job.
The two documents and the underlying risk are covered in HSG282 explained, HSG274 explained, and legionella in hot tubs and spa pools. This page is the comparison and the decision aid: which document governs what, and what changes when you follow the spa-specific one.
The two documents compared for a hot tub operator
| HSG274 | HSG282 | |
|---|---|---|
| Scope | All risk systems: cooling towers, hot and cold water systems, and other systems including spa pools | Spa-pool systems alone: hot tubs, spa pools, and similar recirculating warm-water systems |
| Depth on hot tubs | General principles: assess, control, monitor, record | Operational detail: disinfectant and pH control, testing schedule, filter and water-line hygiene, bather rules |
| Control philosophy | Temperature and turnover where possible; treatment where temperature control is not feasible | Continuous chemical control, because a hot tub cannot be run outside the growth temperature range |
| Best used for | The legal and technical framework, and the building's other water systems | The tub itself: daily operation, testing, cleaning, and records |
Why hot tubs get their own document
Most building water systems are controlled by temperature: hot water kept too hot and cold water too cold for legionella to multiply. A hot tub cannot use that strategy. Its entire purpose is water held at bathing temperature, which is also the middle of the 20 to 45°C growth range. Add jets and blowers producing a fine aerosol, bathers introducing organic load that feeds biofilm and consumes disinfectant, and water that recirculates rather than being replaced, and you have the highest-risk system most small businesses will ever operate. Outbreaks linked to spa pools have repeatedly exposed whole groups of people at once, and holiday-let hot tubs have featured in HSE enforcement, as the enforcement tracker shows.
Because temperature control is off the table, the entire burden falls on water chemistry and hygiene, and that is what HSG282 specifies in detail: continuous disinfectant dosing with the level checked on a schedule, pH held in the range where the disinfectant works, routine microbiological testing, filters and water lines cleaned on a cycle, water replaced at intervals linked to bather load, and rules for bathers. None of this is optional polish; it is the substitute for the temperature barrier every other system relies on.
Every other water system is controlled by temperature. A hot tub cannot be, so chemistry and hygiene carry the whole load. That is why spa pools have their own guidance document, and why the daily testing records are the control, not an afterthought.
The holiday-let trap
The most common misunderstanding is that a hot tub at a holiday cottage is a domestic tub. It is not. Once the tub is offered to paying guests, it is a spa-pool system operated as part of a business undertaking, and the duty under the Health and Safety at Work Act applies in the ordinary way: a risk assessment, a written scheme of control following HSG282, and records. Our guide to legionella in holiday lets sets the tub in the context of the whole property, including the taps and showers that HSG274 still governs.
Free legionella risk assessment template
A structured Word document following the five-step approach in ACOP L8. Covers risk identification, written scheme, monitoring, and records. If it isn't written down, you can't evidence it.
Follows ACoP L8 and HSG274 Part 2. Free. No spam.
Using both documents together
In practice the two documents divide the property. The hot tub follows HSG282: its own dosing, testing, cleaning, and logging routine. The rest of the water system, the stored hot water, the cold feed, the taps and showers, follows HSG274 Part 2 and the standard temperature regime. Both sets of records belong in one place: a log book where disinfectant and pH readings sit alongside outlet temperatures and flushing records, all kept for at least five years. And the standing discipline applies to both: the documents record and structure the control regime. No certificate, test strip, or tidy log makes a tub safe on its own; the regime does, on the days it is actually carried out, and the records are how you show it was.
Free legionella risk assessment template
A structured Word document following the five-step approach in ACOP L8. Covers risk identification, written scheme, monitoring, and records. If it isn't written down, you can't evidence it.
Follows ACoP L8 and HSG274 Part 2. Free. No spam.
Frequently asked questions
Which guidance applies to a hot tub in a holiday let?
HSG282. A hot tub or spa pool made available to paying guests is a commercial spa-pool system, even when it sits in the garden of a single holiday cottage, and HSG282 is the HSE guidance written specifically for controlling legionella and other infectious agents in spa-pool systems. HSG274 provides the general background, but the day-to-day operating regime for the tub itself, disinfection, pH control, testing, filter hygiene, and records, should follow HSG282.
What is the difference between HSG282 and HSG274?
HSG274 is the HSE's general technical guidance on controlling legionella in water systems, covering cooling towers, hot and cold water systems, and other risk systems in three parts. HSG282 is dedicated to spa-pool systems and goes into far greater operational detail for them: continuous disinfectant dosing and pH control, a schedule of water testing, filter and water-line cleaning, bather rules, and record keeping. For a hot tub, HSG282 is the working document; HSG274 is the framework it sits inside.
Why are hot tubs such a high legionella risk?
A hot tub combines every condition legionella needs in one unit. The water is held warm, squarely in the 20 to 45°C growth range. Jets and blowers churn it into exactly the fine aerosol that carries the bacteria deep into the lungs. Bather load introduces organic matter that feeds biofilm and consumes disinfectant, and the water is recirculated rather than replaced. Outbreaks linked to spa pools have repeatedly shown how quickly a poorly managed tub can expose many people at once, which is why the HSE gave them their own guidance document.
Does HSG282 apply to domestic hot tubs?
HSG282 is aimed at spa pools in commercial and business settings, which includes holiday lets, hotels, gyms, and display tubs. A purely private domestic hot tub used by one household is outside its direct scope, but the physics and microbiology are identical, so the same principles, continuous disinfection, pH control, regular testing, filter cleaning, and water changes, are simply what safe operation looks like. The moment the tub is offered to paying guests, it is a commercial system and the HSG282 regime applies in full.
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