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A camper using the outdoor shower on a motorhome fitted with a Gulfstone tankless RV water heater, at a mountain campsite

RV water heaters · OEM / ODM / replacement

RV Tankless Gas
Water Heater Manufacturer,
Built to Your Recess

Built in Shunde, Foshan and matched to the recess, the 12 V scheme and the destination gas setting your vehicle already carries — a drop-in fit, not a re-wire. Combustion is proved on every unit rather than sampled, and a spec question comes back in 48 hours.

Send your recess
65,000 BTU
rated load
2.64 GPM
at 45 °F rise
100 PSI
max water pressure
3
builds

Retrofit and cold climate

The five ways an RV water heater fails a buyer.

Retrofit and cold-weather failures look nothing alike on a spec sheet and identical in a warranty bay. Here is what goes wrong, and what the build does about it.

No.Failure modeWhy it happensWhat we do about it
  • 01

    The cut-out does not match

    A unit specced from a catalogue photo arrives a few millimetres off the recess — and fails end-of-line the day the trailer is finished.

    Send the recess drawing. Unit, door assembly and trim ring are matched to your cut-out before the first run, and the tolerance is written into the QC gate.

  • 02

    The gas path is set for the wrong market

    Propane and LPG behave differently. A unit set for one market then shipped to another runs weak or hot, and nobody notices until a customer does.

    Gas setting and orifice are locked to the destination market and certified with the unit — a commissioning step, not an afterthought.

  • 03

    The 12V scheme does not match the panel

    A vehicle already carries its own pump and panel. A heater that assumes a different harness means a re-wire in the bay, which is where retrofit labour goes.

    The control side runs on DC 12V, and the harness, controller position and connector are matched to the scheme your vehicle already carries.

  • 04

    The compartment is too shallow for the door

    A tankless unit is compact, but the door still has to swing inside the bay. Depth is the constraint a plan drawing hides.

    320 mm of body depth, and the door assembly ships as part of the build rather than an accessory — so swing clearance is engineered with the unit, not around it.

  • 05

    It freezes the first hard night

    Water left in an exchanger through a cold snap splits the coil — the most common off-season failure on a trailered unit.

    The exchanger is drained by a procedure that ships with the unit, so it never sits full through a hard freeze. Winterising is in the manual.

Inside the unit

Five parts, and the RV problem each one solves.

A tankless heater in a vehicle has four things working against it: a pump that runs at low pressure, a tap that cycles on and off, thin air at altitude, and water drawn from a tank. These are the components that answer them.

  1. Water-flow sensor
  2. Bypass heat exchanger
  3. Combustion fan
  4. Proportional gas valve
  5. Premix burner

The exchanger is on a priced spares list on your program, so a service bay can quote it without a factory email. Gas setting, thermostat and mains-powered variants are a bench change on the same platform — see OEM / ODM below.

  • The Gulfstone RV water heater water-flow sensor: a black glass-filled nylon body with a three-wire harness and plug, on a grey ground

    Water-flow sensor

    Fires at 0.02 MPa

    Reads the flow and signals the controller to ignite.

    Fires on RV pump pressure. An RV water system runs off a 12 V pump, and pressure sags the moment a second tap opens or a filter clogs — a sensor that needs strong flow is a unit that will not light. The hall element has no moving parts to scale up.

  • The Gulfstone RV water heater bypass heat exchanger: a TP2 oxygen-free copper coil brazed to a stainless mounting plate, with threaded inlet and outlet stubs

    Bypass heat exchanger

    TP2 oxygen-free copper

    Transfers combustion heat into the water. A bypass path routes water around the coil while the burner is off.

    Ends the cold-water sandwich. The known tankless fault is a scalding slug on restart — water sits in a hot exchanger when the tap closes, then comes out first. In a vehicle the tap is cycled constantly. The bypass limits that standby rise, and oxygen-free copper does not go brittle after repeated heating.

  • The Gulfstone RV water heater combustion fan: a sheet-metal scroll housing and motor with a cylindrical exhaust outlet and its mounting bracket

    Combustion fan

    Rated to 5,000 ft

    Supplies combustion air and drives exhaust out through the flue.

    The controller reads its speed. If the fan cannot reach the speed the load needs — thin air at altitude, a gust across the flue — combustion stops rather than running rich. That monitoring is what the altitude rating rests on.

  • The Gulfstone RV water heater proportional gas valve: a die-cast body with two solenoid coils and a modulating section, stamped QB

    Proportional gas valve

    2 shutoff + 1 modulating

    Two shutoff valves in series, plus a valve that modulates the gas.

    Holds temperature instead of stepping. The controller opens the valve by degree as flow or demand rises, so the outlet holds steadier than a burner that can only be on or off — and there are two valves between the gas line and the flame.

  • The Gulfstone RV water heater premix burner: a stainless burner box with its slotted burner bar laid beside it, on a white ground

    Premix burner

    Closed chamber · stainless

    Burns a metered gas-air mixture inside a closed chamber.

    The mixture is set before it burns rather than drawn in at the flame, so combustion is more complete and quieter — and the flame never sits in the open where a draught can reach it.

The range

Three builds. One platform.

The builds differ in exactly two components. Everything else is common to all three — the same heat exchanger, the same gas path, the same control side, the same dimensions.

Black Gulfstone tankless RV water heater with front door closed and access latch
  1. 01

    ECO

    The entry build — the platform without the tempered-water chamber.

  2. 02

    PLUS

    ECO plus the tempered-water chamber, which holds the outlet temperature steady through a pressure change at the tap.

  3. 03

    PRO MAX

    PLUS plus a copper front connector. The two additions are the only differences across the range.

Every build ships with these

Rated thermal load
65,000 BTU
Gas type
Propane
Gas consumption
20 MJ/h
Gas inlet pressure
2.62–3.49 kPa (rated 2.75 kPa · 11" WC)
Water flow
2.64 GPM at 45 °F rise · 10 L/min (Δt=25 K)
Temperature setting
35–51 °C (95–124 °F)
Maximum water pressure
100 PSI
Power input
DC 12V (10–17V, >5A)
Enclosure colour
White or Black
Certification
CSA · AGA

What changes, and where

The two components that differ across the Gulfstone RV water heater builds, and which builds carry each.
ComponentECOPLUSPRO MAX
Tempered-water chamberHolds the outlet temperature steady through a pressure change at the tap.Not fittedFittedFitted
Copper front connectorA copper connection brought out on the front face, instead of on the side.Not fittedNot fittedFitted

Colour, shell finish, controller position, carton artwork and manual language are set per program. Tell us the market and the vehicle and we scope it from there.

Choose a build

Protection

Built to protect the unit, so the shower is the last thing on your mind.

Every protection here cuts the burner or the supply when something is wrong — except freeze protection, which runs the burner to stop a hard night splitting the exchanger.

  • 01Vehicle battery protection12 V DC
    • A fault here is the battery you are stranded on
    • Sagging, spiking or reversed supply cuts the burner — it never ignites into it
  • 02High-altitude adaptation5,000 ft · 1,524 m
    • Thinner air changes the air-gas ratio
    • The controller reads the fan and holds the mixture, so a burner set at sea level does not run rich up a mountain
  • 03Freeze protectionAuto below 0 °C
    • The one protection here that heats instead of cutting
    • It cycles the burner to keep the exchanger from splitting — it does not wait for an owner who is not there
  • 04Flue-pressure protectionFan-monitored
    • A gust across the flue is how an outdoor unit loses its flame
    • Fan speed is monitored, and combustion stops before a disturbed draught turns into a bad burn
  • 05Dry-fire protectionFlow-proven
    • Lighting the burner with no water cracks the exchanger within minutes
    • The unit will not burn until the flow sensor has proved water
  • 06Flame-out protectionIgnition proven
    • Ignition is proved before gas is allowed to stay on
    • If the flame fails to establish or lifts off, the gas is cut rather than left flowing

OEM / ODM

A custom RV water heater is a list of things that move.

Every row below is a line item you can change, priced against how it changes the build. The first column is what you get if you ask for nothing.

Eleven of these twelve move without new tooling. Only a private shell needs a mould cut, and that is the one line that changes the MOQ.

Customisation options for the Gulfstone RV water heater, by what the change costs in tooling and how it is certified.
Line itemIn the platformCustom, no toolingPrivate tooling
Brand and labelRun as an RV tankless water heater OEM program under your brand, or private-label the incumbent panel you already sell.
Shell and handle mouldA private shell needs a mould cut. Colour and finish do not.
Cut-out and flangeMatched to your recess from a drawing, so it drops into the bay you already build.
Gas setting and orificeLocked to the destination market — propane or LPG — and certified with the unit.
Thermostat rangeThe 35–51 °C band is standard; a market may specify a different range or a fixed setpoint.
Electrical systemPropane on a DC 12V control side is the platform. A mains-powered or dual-fuel variant is engineered to your market spec.
ControllerWall controller as standard; position, harness and connector matched to the vehicle.
Door assembly and trim ringSupplied with the unit so the swing clearance is engineered in, not sourced around.
Packaging and cartonBarcode, hero art and carton spec to your channel — retail box or bulk export.
Manual languageAny market, shipped inside the load rather than added at the destination.
Certification targetLocked to the market you are selling into — the compliance band below maps which standard that resolves to.

A platform SKU — our unit, your branding and pack — starts at a low per-SKU MOQ, so a first order does not have to fill a container. A private mould steps up with the program.

Get a tooling quote
Available Not available

Compliance

The mark follows the market, and it travels with the load.

Certification attaches to one tested configuration. Change the gas setting, opening size or control side and it is a different build — so the target is locked before the tooling, not chased after the container.

Name the market and the model, and the marks follow from it rather than being argued about afterwards.

Certification paths for the Gulfstone RV water heater, by destination market, standard and the paperwork that ships with the load.
MarketStandardWhat it coversShips with the load
Australia / New ZealandAGA · AS 2652Gas appliance safety for a propane or LPG small water heater, at the market gas setting.Test report and declaration inside the container.
North AmericaCSA · ANSI Z21.10.3Gas-fired storage and tankless water heaters, including the RV and travel-trailer configuration.Certification file and the mark on the rating plate.
Europe / UKCE · EN 26Gas-fired instantaneous water heaters for sanitary use, at the market gas family.Declaration of conformity and the CE mark on the unit.
Where the market asksRoHS · REACHRestricted substances across the housing, fittings and the electrical side.Material declarations with the shipment.
High altitudeTested to 5,000 ft (1,524 m)Combustion stability where thinner air changes the air-gas ratio — mountain campgrounds and high-desert routes.Altitude certification with the model you lock.

Tell us the destination market and the model and we map the marks before the tooling is cut. Third-party inspection — SGS, TÜV or your own agent — is welcome at any build stage, and a plant audit is on file.

Map my certification path

Manufacturing discipline

Four gates. Every batch.

Every RV batch is sampled to a named standard, and the combustion gate runs on every unit — a gas fault cannot be averaged away.

  1. Gate 01

    Incoming material

    • Copper, gas valves, burners, igniters, the brushless fan
    • Module board checked against the locked spec
    Standard
    MPI 2.0
    Sampling
    AQL 1.0
  2. Gate 02

    Cut-out and dimensional

    • Recess, door panel and trim ring measured against your drawing
    • The dimensions that decide whether it drops into the bay you build
    Standard
    ISO 2859
    Sampling
    AQL 2.5
  3. Gate 03

    Combustion and gas safety

    • Premixed burn-in at the market’s gas setting
    • Dual-valve ignition, flame-out, flame-proving circuit
    • Run on every unit, not sampled
    Standard
    EN 26 / CSA 4.3
    Sampling
    100%
  4. Gate 04

    Pack and drop

    • Export carton and internal bracing
    • 1 m drop on the packaged unit
    Standard
    ISTA
    Sampling
    AQL 4.0

Third-party inspection — SGS, TÜV or your own agent — is welcome at any gate, and a plant audit is on file.

Why buy it from the plant

They sell you a water heater. We make the one you sell.

A brand carries its own margin and sells through a dealer network. A factory sells to you, and answers to you when a tolerance moves.

01

We are the plant, not a brand

  • No one sits between your PO and the line
  • Built on our own floor in Shunde — a spec question is a bench change, not a supplier call
02

The web is audited, not anonymous

  • Housings, doors and fittings come from an audited network
  • A component failure is our problem to answer, not yours to chase
03

You can check all of it

  • Every figure here has a source we can show you
  • Ask for the paperwork, or come and walk the line

Customer reviews

What RV buyers say

Quotes from the OEM engineers and aftermarket distributors this line sells to — and what the spec sheet leaves out.

“The cut-out matched the incumbent. There was no line change.”

Our trailer program was locked to a recess and a 12V scheme, and the last supplier drifted a few millimetres between lots — enough to fail end-of-line on a bad day.

Engineering replaced the guesswork. They reviewed our drawings against the recess, ran samples through our own fixture, and sent back DFM notes we had not asked for.

AQL 2.5 has held across every lot since, and a tolerance question gets answered inside 48 hours. Across 600 units off the line, the dimensional reject count is still zero.

Ryan Doyle, Engineering lead at a North American camper OEM
Ryan DoyleEngineering lead at a North American camper OEM
“A failed unit is a repair now, not a return.”

We stock RV water heaters for the service trade, so our real cost is never the unit — it is the bay that sits waiting while a part comes from overseas.

Gulfstone put a priced spares list behind the program and shipped the door assembly and controller as stocked lines. Nothing waits on a factory email to be quoted.

The defect rate has held at 0.5% across three production runs, our repeat order sits at 98%, and units that would have been written off are being rebuilt in the yard instead.

Anja Køhler, Category manager at an RV aftermarket distributor
Anja KøhlerCategory manager at an RV aftermarket distributor

Questions buyers ask

Before you place an order

The questions that come up most often on an RV program — answered up front, with the standard or the number attached.

01Can I buy an RV tankless water heater as an OEM, under my own brand?
Yes. As a tankless RV water heater OEM we build the platform under your brand, and the OEM / ODM band above is the list of what moves when the program is yours. Send a drawing, a destination market and an annual volume and the lab scopes the SKU from there.
02Do you supply propane RV water heaters wholesale?
Yes — propane RV water heater wholesale is the core of the line, and LPG is built on the same platform. The gas setting is locked to the destination market and certified with the unit, so what lands is what you sell. Tell us the volume and we quote to it, including mixed-container loads.
03Is there an electric or dual fuel RV water heater option?
The platform as built is propane on a DC control side, which is what a travel trailer or camper already carries. As a dual fuel RV water heater supplier we will engineer a mains-powered or dual-fuel variant to your market spec — an electric RV water heater is a custom build with its own certification, not a configuration of the stock unit. Tell us the vehicle and the electrical system and we scope it.
04Will it replace the water heater already in my RV?
That is the common case, and it is a drawing question rather than a catalogue one. As a custom RV water heater manufacturer we match the unit, the door assembly and the trim ring to the recess you already have, so it drops into the bay rather than being rebuilt around. Send the cut-out and we confirm the fitment before the tooling is cut.
05Can you supply RV water heater replacement parts?
Yes. As an RV water heater replacement parts supplier the serviceable line ships on a priced list attached to your program, so a service centre can quote a repair without a factory email. Tell us your model and market and we send the list with your order.
06Do you build for travel trailers as well as motorhomes?
Yes — as a travel trailer water heater manufacturer we build for that case, and the constraint that decides the fitment is the bay depth and the swing clearance rather than the vehicle class. Send your recess and we confirm against it.
07What is your MOQ for an RV water heater program?
A platform SKU — our unit, your branding and pack — starts at a low per-SKU MOQ, so a first order does not have to fill a container. A private mould steps up with the program. Tell us your estimated annual volume and we scope the starting point in the first reply.

Start a program

The brief goes to the engineer who builds it.

Market, annual volume and the certification it must carry — three lines, and we have what we need. Your reply comes from the engineer who would run the line, scoped to your program rather than matched off a shelf.

Open a bulk inquiry