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Canal Boat Heating, Gas, Water and Sanitation
Canal Boat Heating, Gas, Water and Sanitation
2 min read · Updated 2026-02-13
Canal Boat Heating, Gas, Water and Sanitation
What this covers
Installation, servicing and repair of the systems that make a boat habitable: solid-fuel stoves and chimneys, diesel heaters (Webasto, Eberspacher, Mikuni and Hurricane-style boilers), back-boilers and radiator circuits, gas hobs, ovens and instantaneous water heaters, freshwater pumps and accumulators, calorifiers, pump-out and cassette toilets, and grey/black water tanks.
What to look for
- For gas work: a Gas Safe registered engineer with the LPG and boats categories on their registration card. The applicable installation standard is BS EN ISO 10239 (Small craft — Liquefied petroleum gas (LPG) systems), supported by PD 54823 for design, commissioning and maintenance. Anyone working on the gas system on someone else's boat for reward must be Gas Safe registered for the relevant categories.
- For solid-fuel installations: HETAS competence is the recognised land-side benchmark, and although it does not formally cover boats, an installer holding it plus boat-specific experience is a reasonable starting point. The flue, hearth and shielding must comply with BSS requirements.
- For diesel heaters: manufacturer training (Eberspacher and Webasto operate authorised installer networks) and a stated approach to fuel pickup, exhaust routing and silencer position.
- For sanitation: clear advice on tank capacity, vent runs and macerator vs. gravity discharge, plus Elsan or self-pumpout discharge plans.
- A test certificate after gas work (manometer / bubble-tester reading recorded with date) and after pressure-testing water systems.
- Red flags: gas work offered by an engineer without LPG/boats categories, solid-fuel install without proper hearth and heat-shield detail, "no certificate provided" on gas.
Common questions
Do gas installers on boats need to be Gas Safe? Yes — anyone doing gas work for reward must be Gas Safe registered with the relevant LPG and boats categories. DIY on your own boat is legally permitted but the installation must still meet BSS requirements.
How often should the gas system be tested? Annually as good practice, and at every BSS examination (every four years). A bubble tester fitted in the gas locker lets owners do interim leak checks.
Solid-fuel stove or diesel heater? Stoves give cheap, dry heat and a fallback if power fails, but need fuel-handling space and ash disposal. Diesel heaters are clean and thermostatic but depend on batteries and clean fuel.
Cassette or pump-out? Cassettes are cheaper to install and emptied free at Elsan points; pump-outs hold more, are more comfortable for liveaboards, and cost a few pounds per emptying.
How big should the water tank be? 200–400 litres is typical; a couple living aboard and washing daily uses around 50 litres a day between them, more with a washing machine.
When you need this
Annual heater and gas service, after any system change (new appliance, new stove, repositioned cylinder locker), as part of preparing for a BSS exam, when commissioning a new build or sailaway fit-out.