Sea-Fire Marine

Forty Years of the Bottle Nobody Thinks About Until It Fires

Sea-Fire's own account of itself is short on specific founding dates but long on scale: the company describes itself as a global leader in the design and manufacture of fire suppression and detection systems for the marine and pleasure craft industry, with more than 40 years behind it. Ernie Ellis serves as president and Steve Ellis Jr. as marketing director, and the business relocated its North American headquarters to a purpose-built 30,000 sq ft facility at 9351-G Philadelphia Road in Baltimore in December 2017, with manufacturing split between the United States and the United Kingdom.

The company markets itself as the first fire extinguisher manufacturer to use DuPont's FM-200 agent for marine applications, a claim that is its own rather than independently verified, but the certifications behind the current range are real and extensive: CE, DNV, FM, GL, the Hong Kong Fire Services Department, Maritime New Zealand, RINA, SAMSA, Transport Canada and the US Coast Guard all appear on the FD and FG series datasheets.

Two Agents, and Why the Choice Actually Matters

Both agents are clean agents: they leave no residue, are electrically non-conductive and are safe to discharge into a space where people might be present, which matters on a boat because nobody can guarantee an engine room is empty when a fire starts. FM-200 reaches extinguishing concentration in 10 seconds or less and takes up to seven times less storage space than an equivalent CO2 or inert gas system, according to the manufacturer, and it is accepted under the US EPA's Significant New Alternatives Policy as a replacement for agents banned under the Montreal Protocol.

Novec 1230, the agent behind the newer NFD and NFG lines, carries what one boating publication describes as almost no global warming potential against FM-200's more middling figure, and it costs slightly more as a result. Sea-Fire's own FD-series specification calls for a minimum 8.7 percent atmospheric concentration inside the protected compartment, reached in 10 seconds or less, which is the number an installer is actually sizing the bottle against rather than the cubic footage alone.

An engine that keeps running after the bottle fires does not survive the fire. It just breathes the extinguishing agent straight back out again.

The Pre-Engineered Range, and What It Costs

The pre-engineered FD, FG, NFD and NFG systems are sold in 25 cubic foot increments and cover most recreational and light commercial engine rooms, from 25 cubic feet up to 1,800 cubic feet in Sea-Fire's own catalogue. Real retail prices through Go2marine, a US marine retailer, start at USD 320.00 for the smallest NFG bottle and USD 800.00 for a 150 cubic foot automatic FD system, rising to USD 885.45 and up for the Novec-based NFD range. None of these figures include installation, engine shutdown wiring or the manual discharge cable a manual-capable model requires.

Southern Boating, a US boating publication, puts a complete fitted system at roughly USD 1,500 for a 300 square foot engine room and about USD 2,900 for a 750 square foot space, with a full system on a 50 foot boat running USD 2,500 to USD 3,000 all in. Owner reports on European forums run higher: a Sealine S37 owner was quoted GBP 2,000 including installation for an NFD-250M Novec system to replace a 20 year old FM-200 unit, and posters on the same thread cited fitted prices from EUR 1,400 to EUR 2,000 depending on the yard and whether an inspection was included.

Above 1,500 Cubic Feet: the Engineered Systems

A large expedition yacht's machinery space, or a workboat's engine room, routinely exceeds what a catalogue bottle can protect, and that is where Sea-Fire's engineered systems take over: custom-designed installations from 1,500 up to 17,500 cubic feet, tested to IMO/SOLAS and carrying approvals from USCG, RINA, DNV, Lloyds/MCA, GL, Transport Canada and the Australian and New Zealand maritime authorities. Release options span manual, automatic, manual with a time delay, or electrical release, chosen to match how the vessel's class society and flag state expect the system to behave.

Sea-Fire's own marketing director, Steve Ellis Jr., describes the sizing process itself as simple: specifying a fixed system can be as straightforward as taking a few measurements of the space. What is not simple is everything downstream of that measurement, which is why the company's own installation and design service, offered directly through at least one of its California dealers, is limited to consultation, design, installation and commissioning within that state, with equipment-only sales and third-party fitting the option everywhere else.

The Detail That Actually Decides Whether It Works

Chris Washburn, president of Washburn's Boat Yard in Solomons, Maryland and the American Boat and Yacht Council technical board member responsible for Standard A4 on fire-fighting equipment, makes the point plainly: if the engines keep running after the bottle discharges, they ingest and exhaust the suppressant along with everything else moving through the compartment, which defeats the whole system. Automatic engine shutdown becomes essential wherever the air change rate in the space exceeds about once a minute, which describes most engine rooms under way.

Sea-Fire sells the answer as an accessory rather than assuming it: the ESRS, or Engine Shutdown system, alongside Early Warning Heat Sensors and Manual Discharge Cable Assemblies. Washburn separately recommends a redundant manual-only backup system alongside the automatic one, at roughly USD 1,000 on top of the main installation, as insurance against an automatic system that discharges prematurely or fails to trigger. Notably, Passagemaker's own reporting flags that Sea-Fire's manual-pull systems, originally developed for racing use, are not USCG-approved for marine installation, which is a distinction worth checking model by model rather than assuming every product in the catalogue carries the same approval.

Lithium Batteries Are a Different Fire, and a Newer Product Line

A lithium-ion cell in thermal runaway generates its own oxygen internally, so a clean agent that works by starving a normal fire of oxygen is fighting a losing battle. Sea-Fire's AT-series answers this with a patented aerosol-generating mechanism that discharges automatically when ambient temperature reaches fire conditions, sold in three charge weights read directly off the canisters: the AT-593 at 100 grams, the AT-1490 at 250 grams and the AT-3210 at 500 grams, all US Coast Guard approved and manufactured in the United States.

Alongside the fixed AT-series, Sea-Fire markets LiCELL, a portable extinguisher line built specifically for lithium battery fires, in four graduated stainless steel sizes from a handheld unit up to a larger cylinder with its own carry handle. Both product lines are recent additions next to the decades-old FD and FG range, which says something about how fast lithium battery banks, e-tender motors and house batteries have gone from novelty to standard equipment on the boats Sea-Fire's core customers actually own.

Servicing, Replacement and What the Label Actually Requires

The instructions printed on an NFD cylinder's own label are specific: check the pressure indicator and weigh the unit semi-annually, record the date and weight on the inspection tag, and remove the system from service immediately if it has discharged or if its weight has dropped by more than the stated allowance. Forum owners who have gone through a replacement report the regulatory side has actually loosened in recent years: a poster citing current US Coast Guard guidance says a recreational vessel's extinguisher no longer needs a professional inspection certificate, only annual verification by the owner, provided the unit is less than 12 years old.

What owners cannot avoid is the eventual bottle swap, and real prices for that vary enormously by route. One owner who replaced a 2009 FG 50A found online prices from USD 300 to USD 800 before hazmat shipping, and ended up paying Sea-Fire directly in Baltimore before a partial refund brought the net cost to about USD 247. Another reported paying just USD 100 for a Novec-agent bottle through a local fire equipment dealer in Oakland, California, and West Marine has been known to sell a Sea-Fire Novec unit for around USD 85, a reminder that the same part can cost eight times as much depending entirely on where an owner buys it.

Against Fireboy-Xintex and Kidde

Fireboy-Xintex and Sea-Fire are the two names most US boating publications reach for first, and both sell clean-agent systems on the same two chemistries, HFC-227ea and Novec 1230. Keith Larson, Fireboy-Xintex's vice president of sales, describes his company's pre-engineered systems as covering up to 4,000 cubic feet, with the broader Fireboy range running to 17,300 cubic feet before a project needs a fully engineered solution, a notably higher single-catalogue ceiling than Sea-Fire's 1,800 cubic foot pre-engineered limit before the same jump to custom engineering.

Kidde, the third name that comes up regularly, is a much broader fire-safety conglomerate with marine as one product line among many, and tends to compete on price at the small portable end rather than on engineered systems for large yachts. For an owner comparing quotes, the practical difference usually comes down to which brand the local installer already stocks and is trained on, since the underlying chemistry and the sizing logic are close to identical across all three.

Who Actually Needs to Think About This

An owner buying a boat with an existing system inherits somebody else's installation choices, and the two questions worth asking immediately are how old the bottle is and whether an engine shutdown is actually wired to it, since both determine whether the system will do anything useful in a real fire. A yard fitting a new system out should be sizing it against the compartment's real cubic footage and the specific agent's minimum concentration, not against whatever bottle happens to be on the shelf.

The newer risk is the battery bank rather than the engine, and an owner who has added lithium house batteries, an electric tender or a hybrid drive since the boat was last surveyed should ask specifically whether the existing system, sized for a fuel and electrical fire, does anything useful against a battery fire at all. In most cases it does not, which is exactly the gap the AT-series and LiCELL lines exist to close.

A chi si rivolge: Owners and yards specifying or replacing engine-room fire suppression, and anyone who has added a lithium battery bank, e-tender or hybrid drive since the boat was last surveyed for fire risk.