Ruud Water Heater noise diagnosis in Greater Vancouver
A water heater that has run quietly for years does not suddenly get loud for no reason. The sound is the unit telling you something changed: a deposit layer thickened, a fitting loosened, a valve started to close on itself, a fan bearing wore.
In Metro Vancouver we hear a particular pattern. Tanks tucked into unheated garages, crawlspaces and utility closets in older Vancouver, Burnaby and New Westminster housing stock sit on cold concrete all winter, and the expansion noises get louder as incoming water temperature drops. Fraser Valley homes on harder groundwater build deposit faster than homes on the soft, low-mineral supply most of the region drinks.
This page walks the noises the way a technician does. Sound, likely origin, what gets checked and in what order, and the specific point where it stops being a homeowner job. Nothing here replaces reading your own Ruud model’s manual and the label inside the access panel.
Listen first: locate the sound before you diagnose it
Stand next to the unit with the hot water off and everything in the house quiet. You want to know three things before you touch anything. Does the noise happen only while the burner or element is running, only while water is flowing, or all the time? Does it come from the tank body, from the pipes above it, or from the vent and combustion area? Does it build gradually or start and stop sharply?
That triage matters because it splits the possibilities cleanly. Noise tied to heating points at the heat transfer surfaces and whatever is coating them. Noise tied to flow points at valves, fittings and pipe supports. Noise that runs constantly points at electrical components or a circulating pump.
Run a simple test. Open a hot tap somewhere in the house and listen again. If the sound appears only then, it is a flow issue and the tank is probably fine. Close every tap, wait for the unit to fire on its own recovery cycle, and listen a second time. If the sound tracks the burner cycle exactly, it is a heating issue.
Write down what you heard and when. A technician who arrives to a quiet unit relies almost entirely on your description, and “rumbles for the first two minutes after it fires” is far more useful than “it makes a noise.”
Rumbling, popping and banging: sediment sitting over the heat source
This is the most common noise complaint on any tank water heater, Ruud included. Minerals and fine sediment settle to the bottom of the tank over time. On a gas model the burner sits directly under that layer. Water trapped underneath and inside the deposit flashes to steam, the bubbles force their way up through the crust, and you get the deep percolating rumble and the intermittent bang that sounds like someone tapped the tank with a mallet.
The giveaway is timing. It starts shortly after the burner lights, peaks partway through the cycle, then quiets when the burner satisfies. It usually gets worse over months, not overnight.
Most of the Metro Vancouver supply is soft surface water, so hard scale is less of a factor here than in many parts of Canada. What we actually find in these tanks is a fine sludge, plus corrosion product from an aging anode and tank interior. Homes in parts of the Fraser Valley drawing on groundwater see more true mineral deposit; check with your municipality if you are unsure what your supply is.
A flush can quiet a mildly loaded tank. Draining and flushing is within reach for a careful homeowner if you follow the procedure in your Ruud manual, but if the drain valve is old and plastic it can fail open and it will not reseat. On a heavily built-up tank the noise usually returns, and the deposit layer is also insulating the burner from the water, which is why the same tank starts taking longer to recover.
Ticking, tapping and knocking that follows the water, not the burner
Sharp, irregular ticking that starts a minute or two into a hot draw and fades after is almost always expansion, not the heater. Copper and PEX lines grow as hot water enters them. When a line passes through a tight hole in a joist or sits in an undersized strap, it slips a fraction of a millimetre at a time and each release makes a click. String a dozen of those together and it sounds like something inside the wall is failing.
Older Vancouver homes with drilled-through joists and lines added over decades of renovations are prime candidates. So is any run where insulation was pulled off during a reno and the pipe now rests bare on framing.
The fix is mechanical and usually simple: relieve the pinch point, add proper hangers with cushioning, or sleeve the pipe where it passes through wood. A tech tracing this puts a hand on the line at accessible points during a draw to feel where the movement is greatest.
A harder, single bang when a tap or an appliance valve shuts is different. That is water hammer, caused by moving water stopping abruptly, and it puts real stress on joints and on the water heater connections. Repeated hammer is worth addressing properly rather than living with, because the failure it eventually causes is a leak, not a noise.
Sizzling, hissing and crackling: check for a leak before anything else
Sizzling from a gas Ruud tank deserves attention right away, because one of the causes is water dripping onto the burner assembly or the hot draft hood. Water landing on hot metal makes exactly that sound. It can come from condensation on a cold tank during a long recovery, which is normal and self-resolving on a new install or after a big draw. It can also come from a small leak in the tank, a fitting, or the temperature and pressure relief line.
So look before you assume. Pull the outer burner access cover if your model has one and check for water on the floor of the cabinet, rust streaks running down the tank body, or a wet drip leg. Check whether the discharge pipe from the T&P valve is wet. If water is coming from the tank itself, the tank is finished; there is no repair for a perforated inner vessel.
Electric Ruud models can sizzle or crackle for a different reason. A deposit layer bakes onto the element surface, and steam pockets form and collapse against it. That is the electric cousin of the sediment rumble.
If you smell gas at any point, or a carbon monoxide alarm sounds, stop. Leave the house, take everyone with you, and call the gas utility and a licensed technician from outside. Do not relight anything, do not open panels, do not use a lighter to look.
Screeching, whistling and squealing: flow being forced through a gap
High-pitched noise almost always means water or gas being squeezed through a restriction. The pitch is a function of how tight the gap is, which is why these sounds are so distinctive and so annoying.
Start at the valves. A partially closed inlet or outlet shutoff, a failing check valve, or a thermostatic mixing valve with an internal cartridge starting to seize will all whistle when flow passes. The test is behavioural: does the sound change when you open a second hot tap? A restriction upstream of the tank usually gets louder as demand rises. A restriction in one branch stays tied to that fixture.
Recirculation systems add another suspect. If your home has a hot water return loop, the pump or a balancing valve in that loop can sing continuously, day and night, whether or not anyone is using water. Shut the pump off at its switch or breaker for ten minutes and see if the noise stops. That single test saves a lot of hunting.
On Ruud tankless units, a whistle can come from the venting or from the air intake if the terminal is partly blocked. On coastal properties near the water, and on any home with a vent terminal close to grade, we routinely find debris, insect nests and corrosion at the terminal. That is not a cosmetic issue. Restricted intake or exhaust affects combustion and safety, and it belongs to a licensed technician, not to a ladder and a screwdriver.
Humming and vibration on electric and hybrid Ruud units
A steady low hum with no obvious start or stop is usually electrical or mechanical rather than combustion-related. On an electric Ruud, an upper or lower element can vibrate against the surrounding water at line frequency, and the tank shell amplifies it. It is generally harmless. It sometimes settles if the element is properly tightened, and it sometimes does not.
Hybrid heat pump water heaters are a different conversation. They have a compressor and a fan, and both make noise by design. What you are listening for is a change: a new rattle from a loose panel, a fan blade catching on a shroud, a compressor that has gone from a smooth hum to a grinding or knocking note. These units also move air, and in a small mechanical room the sound reflects and reads as much louder than it measures.
Placement matters more than people expect in this region. Strata buildings and townhouse complexes across Burnaby, Coquitlam and Surrey often have rules about mechanical noise transmitted to neighbouring units, and a hybrid installed against a shared wall can generate complaints even when it is running perfectly. Anti-vibration pads, a bit of standoff from the wall, and thoughtful location during install prevent most of that.
Buzzing that comes and goes with a click, or any burning smell near the junction box, is not something to monitor. Kill the breaker and call for service.
Ruud tankless noise: combustion, fan and modulation sounds
Tankless units have moving parts a tank does not, so their noise vocabulary is broader. A short fan whir before and after each burn is normal purge behaviour. A brief click as the gas valve opens is normal. What is not normal is a rumble or roar that changes character, a rhythmic pulsing during a steady draw, or a rattle that appears at certain firing rates and vanishes at others.
Combustion noise that has grown louder or rougher over time is a reason to have the burner, heat exchanger and venting inspected. In damp coastal winters the combination of cold intake air and condensate in the venting is hard on these components, and a partially fouled burner or a restricted exchanger changes how the flame sounds long before it trips a fault.
Pulsing during a low-flow draw often traces to the unit cycling near its minimum firing rate. A tap opened just a crack, a low-flow fixture, or a mixing valve set so the unit barely gets asked to work can all produce it.
If the unit throws a code alongside the noise, read the exact code off the display and check it against your specific Ruud model’s manual or the label inside the cabinet. Code meanings vary by brand, model and production year, and guessing from a generic list wastes time. Note the code, note what the unit was doing, and never bypass or reset repeatedly around a safety lockout.
Noises that mean stop now, and what a proper service visit covers
Some sounds are not diagnostic puzzles. If you hear a loud continuous hiss with a gas smell, if a CO alarm sounds, if water is jetting from the relief valve, or if the tank makes a heavy boiling or surging noise while the case is too hot to touch, get everyone out of the house and call from outside. Repeated relief valve discharge in particular can indicate a control or thermostat problem allowing overheating, and it is a genuine hazard.
What you can reasonably do yourself: keep the area around the unit clear, keep combustibles and stored paint away from a gas heater, check the drain pan and floor for water, know where the water and gas shutoffs are, and follow your manual for a flush if you are comfortable with it.
What needs a licensed hand: anything involving gas connections, burner assemblies, venting, the gas valve, thermostats and controls, elements, anodes on a seized fitting, or the relief valve itself. Gas work in British Columbia requires TSBC certification, and replacements generally require a municipal permit.
A HeatLand visit on a noisy Ruud starts with the same sequence in this article: confirm when the noise occurs, verify combustion and venting safety, check for leaks, then work through the mechanical causes. You get a plain explanation of what was found and a free written no-obligation estimate before anything is replaced. Call (604) 330-3812.
Quick Checklist
- Note exactly when the noise happens: during burner or element operation, during water flow, or continuously
- Check the floor, drain pan and T&P discharge line for water before assuming the noise is harmless
- Test a recirculation pump by switching it off for ten minutes to see if the sound stops
- Look for rust streaks, scorching or moisture on the tank body and around the burner access
- Confirm the space around a gas unit is clear of stored combustibles and that the vent is unobstructed
- Read any displayed fault code off the unit and check it against your own Ruud model’s manual
- Leave the home and call the gas utility and a licensed tech from outside if you smell gas or a CO alarm sounds
- Book a diagnostic visit if the noise is new, worsening, or tied to slower hot water recovery
| Sound you hear | What it usually points to | Sensible next step |
|---|---|---|
| Deep rumble or banging during heating | Sediment or deposit layer over the burner or element | Flush per your manual; have the tank assessed if it returns |
| Rapid ticking after a hot draw starts | Pipe expansion against framing or tight penetrations | Locate the pinch point and support or sleeve the pipe |
| Sizzling near the burner area | Condensation, or water dripping from a leak onto hot metal | Inspect for leaks immediately; a leaking tank is not repairable |
| Continuous whistle or squeal | Restricted flow at a valve, mixing valve or recirculation loop | Test valve positions and switch off the recirc pump to isolate |
| Steady hum or vibration | Element vibration, or compressor and fan on a hybrid unit | Note any change in tone; call if grinding, clicking or burning smell |
| Rough or pulsing combustion on a tankless | Burner, heat exchanger or venting condition, or low-flow cycling | Licensed inspection of burner and venting; do not bypass lockouts |
Frequently Asked Questions
Is a rumbling Ruud water heater dangerous?
Rumbling from deposit buildup is usually not an immediate hazard, but it is a warning sign. That layer insulates the heat source from the water, which slows recovery and stresses the tank bottom over time. Rumbling combined with a gas smell, a CO alarm, a hot cabinet, or water discharging from the relief valve is different. Leave the home and call the gas utility and a licensed technician from outside.
Will flushing my tank stop the banging noise?
Sometimes. On a tank with a light deposit layer, a proper flush following your Ruud manual can quiet it noticeably. On a tank that has gone years without maintenance, much of the buildup has hardened and will not come out through the drain valve, so the noise returns quickly. Old plastic drain valves also have a habit of failing open once disturbed, so have a plan before you start.
Why does my water heater tick when nobody is using hot water?
Check for a recirculation pump first. If your home has a hot water return loop, the pump can run on a timer or continuously, keeping water moving and producing expansion ticks around the clock. Without a recirc loop, ticking during idle usually means the tank is on a recovery cycle: it reheats on its own as standby heat is lost, particularly in an unheated garage or crawlspace in winter.
Does hard water cause water heater noise in Metro Vancouver?
Less than people assume. Most of the regional supply is soft surface water, so classic hard scale is not the main driver here. What builds up in local tanks tends to be fine sludge and corrosion product from the tank interior and a depleted anode. Some Fraser Valley communities draw on groundwater that can be harder; check with your municipality if you want to know your actual supply.
When should I replace rather than repair a noisy Ruud?
Replace when the tank itself is leaking, since a perforated inner vessel cannot be repaired. Consider it strongly when the noise comes with slow recovery, rusty hot water, or repeated relief valve discharge on an older unit, because the underlying condition is the tank, not a part. A technician should confirm the diagnosis first. HeatLand provides a free written no-obligation estimate: (604) 330-3812.
Reviewed by the HeatLand Heating & Cooling team — licensed, insured, TSBC-certified HVAC contractor serving Metro Vancouver & the Fraser Valley since 1999. Error codes, specifications, pricing and rebate programs vary by model and change over time; confirm details against your unit’s own manual, a written quote, and the manufacturer or CleanBC/FortisBC. If you smell gas or your CO alarm sounds, leave the home and call the gas utility and a licensed technician from outside.