Boats with LPG (gas)

This section outlines very briefly what you must think about for the BSS examination if you use gas aboard your boat. If you use portable gas equipment, some of this information is still relevant and could keep you safe.
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Critical Safety Notices: Gas Equipment

Morco Products Ltd open flued water heaters - critical safety upgrade alert

July 2024

The BSS is supporting Morco, in its on-going campaign to find and fix potentially dangerous models of its LPG water heaters that may leak gas causing fires or explosions.

Following concerns that appliance test-point screws may not have been correctly tightened at the time of commissioning or servicing, Morco has issued a safety alert and is offering free upgrades for the affected models.

There is more information on our Known Recalls, Safety Alerts and Warnings webpage [LINK].

Or download the briefing [LINK]


January 2024 - Calor’s Network Team reaffirmed that Calor is to continue to supply the 3.9kg propane and 4.5kg butane cylinder sizes.

It has told the BSS that it is working hard to return supply to normal as soon as possible. We welcome this latest announcement to continue to supply these smaller cylinders as it could mean that boaters may not need to make any changes to the boat’s LPG system to suit a different size of cylinder.

The full Calor statement and position is set out in our news release


How to store LPG to comply with BSS Requirements

LPG is 'heavier' than air and if it leaks out of the gas system, it can flow down into the cabin or engine space and create an explosive vapour cloud. So in broad terms, your storage needs to ensure that if there was a leak, then it won’t enter the interior of the boat and will be safely directed overboard.

To meet compliance with your navigation authority rules, and to keep everyone safe, please read the BSS Examination Checking Procedures (ECP), Part 7 (section 7.1 - 7.8) for the BSS checks relevant to gas storage and for greater explanation, the first few pages of Appendix 7 in the same document [LINK]. The ECPs explain, in full detail, what BSS Examiners will look for when they carry out the BSS Checks on your boat.

Don’t be tempted to refill standard LPG cylinders

Liquid Gas UK, the national trade association for liquified gas supply states this: 'Most LPG cylinders are owned by and remain the property of the gas supplier whose name is printed/ marked on the cylinder. These cylinders are filled by weight and must ONLY be filled in a dedicated filling plant by the gas supplier or their authorised filling contractor. It is unlawful for anyone else (either a company or private persons) to fill these cylinders."

DIY re-filling of standard LPG cylinders such as Calor, Flogas and BP Gas that are intended for factory replenishment is extremely foolhardy as well as unlawful.

However, there are specialist re-fillable cylinders sold by companies such as Gaslow, Gas-It, Prakto and Safefill cylinders designed to be filled at service stations which include the .

Kevin Tyson, BSS Manager, states:

‘Boaters should not to attempt to refill LPG cylinders intended for factory replenishment, as to do so is unlawful and it can be highly dangerous.

‘The potential is very scary with the possibilities of fireballs and explosions happening, if liquid propane or butane is pressure driven through any of the boat’s appliances.

‘The capacity for the harm it could cause to the owner, the boats crew and anyone else in the vicinity of the boat is immense. It could easily be tragic.

'I have instructed Examiners for their and others safety that, if during a BSS Examination, they suspect there is an overfilled or self-filled standard LPG cylinder on the boat, they should abandon the BSS Examination, they should class the boat as ‘immediately hazardous’ and notify my team at the BSS Office and we will inform the navigation authority. The boat owner may still be charged for an examination.'

In general terms, filling cylinders safely is a complex and controlled process the subject of UN Recommendations, international directives, UK Regulations, British and European Standards and UKLPG Codes of Practice.

Liquid Gas UK also states:

"LPG (propane) is potentially hazardous and the filling of cylinders can be a high risk activity which is governed by law to protect you and others."

These codes and regulations exist so that the employees of the LPG cylinder supply companies are not put at risk when refilling the cylinders and so that customers can use the product safely.

Anyone attempting to fill a free-standing LPG cylinder at an autogas station will likely be stopped from doing so by the fuel station staff.’

There is further reading here


Recall of Clesse Novacomet BP1803 LPG ReglatorsNR16-002b update lozenge

The BSS is supporting Clesse Industries to make boaters aware of the immediate product recall on its Novacomet branded BP1803 LPG regulators manufactured between June 2006 and September 2015. Find out more here immediate recall information

Recall of Calor Lite® cylinders 2008-11

Calor Gas Ltd has asked the BSS to help notify boaters that there is an immediate product recall on all 6kg Calor Lite® cylinders manufactured between 2008-2011 inclusive following concerns regarding the potential deterioration of the cylinder. Find out more here immediate recall information

Do you have a Beko, Flavel or Leisure LPG cooker installed on your boat?

There is an on-going Beko campaign to find and fix dangerous older models of Beko, Flavel and Leisure gas cookers that can produce potentially fatal levels of carbon monoxide, if used incorrectly with the grill door closed. Find out more here: Urgent Safety Alert


Boats with LPG (butane and propane) aboard

If your vessel has gas aboard, please remember to prepare the vessel before its examination and ensure there is a supply of gas ready for the examiner to undertake the checks.

LPG cylinder lockers - boat owners must ensure the BSS Examiner can carry out careful checking of the LPG cylinder locker for condition, including the removal of all loose portable items, base protection mats, removable false floors and the temporary removal of connected LPG cylinders.

Discuss your LPG cylinder locker arrangements with your examiner in advance of the examination as this may require your attendance or you to make prior arrangements involving service agents.

LPG lockers not accessible enough to allow an assessment of condition will involve the BSS Examiner having to return to carry out the check with the obstruction removed.

The BSS Examination includes checks on any LPG system covering aspects of the storage of gas cylinders, gas system and the connections to gas appliances.

The complete set of checks can be read on the Priavte Boat Requirements, Hire Boat Requirements and Non-Private Boat Standards in this section of this website

How do we check your boat is free from gas leaks?

The BSS Examination includes a test that checks that the gas system is free from leaks i.e. the gas tightness-test.

However, we would like to stress that the system should be gas-tight (not leaking) all times, not just when the BSS Examination is due.

For boat owners the simplest way of having that assurance is to install a bubble leak detector and use it routinely. A BSS Examiner can also use this device to check the system is gas tight too, if it is installed correctly.

Bubble tester photo Bubble tester diag

Where a bubble leak detector isn't fitted, the BSS Examiner must use a device called a manometer, this has to be connected to a gas test point.

The test point is simply a threaded opening into the gas system. It is sealed by a screw action nipple. To test the system, the nipple is undone, the manometer is connected up, the test is carried out, the manometer is then disconnected and the nipple is tightened back down.  It is tightened sufficiently to seal the test point once more to prevent a gas leak, but not so tight as to damage the seal and cause a gas leak.

Who can carry out BSS Examinations on your boat?

All BSS Examiners are trained and assessed in the same way to carry out checks of the gas system and to be competent undertake gas-tightness tests with manometers or with bubble leak detectors. They are quality assessed and have to undergo periodic retraining and assessment.

However, the use of a boat, affects its status under UK gas legislation, as follows:-

Privately owned boats used solely for leisure and pleasure purposes

If your boat is used by you for private leisure and pleasure use, all BSS Examiners can legally carry out a full Boat Safety Scheme Examination including checking by manometer that the gas system does not leak - the tightness-test.

Please read these other pages if you think your boat is in one of the categories below.

Link to information about - Residential & Domestic use boats, liveaboard craft and houseboats

Link to information about - Hire boats, passenger vessels, commercial and business boats*

The BSS Examiner may ask you about your boat's use:

The examiners who are not on the Gas Safe register are advised as part of their initial dealings with owners to ask in advance of turning up at the mooring, about the status of the craft.

To avoid falling foul of UK law and avoiding criminal prosecution they need to find out whether the boat's use will mean they should not carry out a tightness-test using a manometer.  They may ask the following questions, just for their own personal record:

  • Is the boat hired out in the course of a business?
  • Is the boat used primarily by anyone for domestic or residential purposes (In this matter, it makes no difference to if the boat is owner-occupied or rented-out)?
  • Are people invited on board the boat in the course of a business, e.g. is it a café or shop?

Even if the answer to all the questions above is 'no', the examiner is advised to make a brief record that he or she has asked the questions and received the negative answers. This information will not be shared with BSS Office or other parties unless there is an investigation linked to gas testing by the examiner.

*Note on the BSS Examination for non-private boats - If a vessel is a hire boat, third-party managed share-owned boat, trip boat, rented residential boat, floating business or some other form of commercial or public vessel, the boat will be examined to either the 2017 Hire Boat Requirements or 2002 BSS Standards as stipulated by the navigation authority registering your boat.

Further safety information linked to the use of gas

Fire Safety on Boats - pdf leaflet information_90x90

Carbon Monoxide Safety - CO web page information_90x90

Portable gas appliances - fire safety page information_90x90

Refilling gas cylinders at autogas pumps - LP Gas Association Briefing information_90x90

DIY refilling LPG cylinders - LPG Gas Association Briefing

LPG cylinders supply and return - LP Gas Association Briefing information_90x90