Tankless Water Heater Leak Services in Greater Vancouver

Tankless Water Heater Leak Services in Greater Vancouver

Tankless Water Heater Leak Repair Across Greater Vancouver

A tankless (on-demand) water heater should never leak — there is no storage tank holding water, so any visible water means a fitting, valve, or internal component has failed. Because these units are usually wall-mounted in finished spaces, garages, or mechanical closets, even a slow drip can stain walls, corrode connections, and feed mould before you notice it. ROMA Heating & Cooling has repaired tankless water heaters across Greater Vancouver since 1999, and our gas-licensed, insured technicians diagnose leaks on every major on-demand brand installed in Lower Mainland homes.

If your tankless unit is actively leaking, shut off the cold-water isolation valve, turn off the gas at the appliance, and call (604) 704-0300 for same-day diagnosis before water reaches drywall or electrical components.

Where Tankless Water Heaters Leak — and Why

Identifying where the water is coming from is the first step, because external fitting leaks and internal heat-exchanger leaks are repaired very differently:

• Inlet and outlet connections — the cold inlet and hot outlet threaded joints loosen with thermal cycling and vibration, weeping water at the union.
• Isolation (service) valves — the red and blue service valves used for flushing can drip from the spindle or the bleeder cap if a washer has worn.
• Pressure relief (T&P) valve — this safety valve releases water when pressure or temperature is too high; a constant drip points to excess pressure, thermal expansion, or a faulty valve.
• Heat exchanger — an internal leak here is the most serious failure, usually caused by scale-driven hot spots or a freeze crack over winter.
• Condensate drain (condensing models) — high-efficiency units produce acidic condensate; a blocked or disconnected condensate line or a failed neutraliser can leak.
• Gaskets and seals — internal rubber gaskets harden and shrink with age, allowing seepage at the manifold or pump.

What You Can Safely Check First

A few quick checks help you describe the problem and sometimes reveal a simple cause:

1. Find the source — wipe everything dry, run hot water, and watch where the first bead of water appears.
2. Check whether the drip is at a visible fitting or coming from inside the casing; internal water means stop and call.
3. Make sure the isolation valve caps and the flush ports are closed and snug.
4. On condensing models, confirm the condensate line is connected and draining, not blocked.
5. If you see water near the gas valve or electrical connections, shut off the gas and water and call right away.

Do not attempt to open the heat exchanger, adjust the gas valve, or remove the relief valve — these require a licensed technician.

Tankless Leak: Symptom vs Likely Cause

How ROMA Repairs a Leaking Tankless Water Heater

We pinpoint the leak before touching anything, because the right repair depends entirely on the source:

• External fitting leaks — we re-seal and correctly torque inlet, outlet, and service-valve connections, replacing worn washers and gaskets.
• Relief-valve drips — we test static and thermal-expansion pressure, recommend an expansion tank where needed, and replace a faulty T&P valve.
• Scale-related failures — we descale the heat exchanger to remove the hot spots that crack it, and assess whether the exchanger is still serviceable.
• Condensate leaks — we clear the condensate drain and replace a spent acid neutraliser on condensing models.
• Internal component leaks — we replace failed gaskets, seals, or the flow components, then verify a dry, stable run.
• Repair-versus-replace advice — if the heat exchanger itself has failed on an older unit, we give an honest comparison so you can decide between repair and a new high-efficiency tankless.

Before we leave, we pressure-check the connections, run a full hot-water draw, and confirm there are no drips anywhere on the unit.

Repair or Replace a Leaking Tankless Unit?

Most tankless leaks are external and well worth repairing — a new isolation valve, relief valve, or gasket restores the unit for years. The decision changes when the leak is internal:

• External fittings and valves — almost always repaired, since the heat exchanger and electronics are unaffected.
• Relief-valve or expansion issues — repaired by correcting system pressure and renewing the valve, often with an expansion tank added.
• Heat-exchanger failure on a newer unit — may be covered under the manufacturer’s exchanger warranty, so it is worth checking the model and install date before deciding.
• Heat-exchanger failure on an older unit — once a unit is well past its warranty and the exchanger has cracked, a new high-efficiency tankless is usually the better long-term value, and we will lay out both options with upfront pricing.

Condensing models add a condensate drain and acid neutraliser to the picture, which we inspect on the same visit so a small condensate leak does not get mistaken for a failing exchanger.

Preventing Tankless Leaks

The single best protection is an annual descale and inspection. Flushing the heat exchanger removes scale before it creates the hot spots that crack it, and a yearly check lets us catch a weeping fitting, a tired relief valve, or thermal-expansion pressure before they become a flood. If your unit is in an unheated garage or exterior wall, we will also confirm freeze protection is working so a cold snap does not crack the exchanger over winter.

Because a tankless leak can soak into walls and reach electrical and gas components, we prioritise active leaks for same-day service. ROMA repairs on-demand water heaters right across Metro Vancouver — Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, Langley, and New Westminster. Call (604) 704-0300 and a technician will stop the leak, fix the cause, and restore safe, reliable hot water.

What Our Customers Say

“I had the absolute best experience getting my tankless water heater installed.”

— Alvina August, Google review (★★★★★)

“Good work done by the two hot water heater specialists in fixing the pipes and draining the boiler.”

— Rizwan Kheraj, Google review (★★★★★)

Frequently Asked Questions

Where do tankless water heaters usually leak from?

Most tankless leaks start at the threaded connections — the cold inlet, hot outlet, isolation (service) valves, or the pressure relief valve. Internal leaks from the heat exchanger are less common but more serious, and usually point to scale damage or a freeze crack.

Is a leaking tankless water heater an emergency?

A small drip at a fitting is usually not urgent but should be fixed before it corrodes connections or damages the wall. Water coming from inside the unit, pooling on the floor, or any leak combined with error codes or a gas smell should be treated as urgent — shut off the water and gas and call (604) 704-0300.

Why is water dripping from the pressure relief valve?

The temperature and pressure relief (T&P) valve is a safety device that opens when pressure or temperature climbs too high. Occasional dripping can mean excess system pressure or thermal expansion; constant dripping means the valve or an expansion issue needs attention — never plug or cap it.

Can scale buildup cause a tankless leak?

Yes. Greater Vancouver’s water is relatively soft, but scale still accumulates inside the heat exchanger over years, especially at higher set temperatures. Heavy scale creates hot spots that can crack the exchanger and cause an internal leak — annual descaling greatly reduces the risk.

Do you repair leaks on all tankless brands?

Yes. Our technicians service the tankless brands common across the Lower Mainland — Navien, Rinnai, Noritz, Bosch, Takagi, and Rheem — and stock common valves, gaskets, and fittings so most external leaks are repaired in a single visit.

Related Heating Services

• No Hot Water Emergency
• Hot Water Tank Replacement
• Tankless Water Heater Repair
• Emergency Water Heater Leak Repair
• Why Is My Water Heater Leaking?

Call ROMA Heating & Cooling Today

For fast, professional diagnosis and repair anywhere in Greater Vancouver, call (604) 704-0300 or email info@romaheating.ca. Same-day and after-hours service, gas-licensed and insured, serving the Lower Mainland since 1999.