Your hot water tank doesn’t hibernate for winter, but it sure needs some prep work before the cold hits. Most Surrey homeowners forget about their tanks until something goes wrong, and winter breakdowns always happen at the worst times.
Here’s the thing: winterizing your hot water tank isn’t just about preventing frozen pipes. It’s about making sure your tank can handle the extra workload when incoming water drops from 15°C (59°F) in summer to near 4°C (39°F) in winter. That’s a massive difference, and your tank feels it.
We’ll walk you through the exact steps we use when winterizing tanks, plus the warning signs that mean you need professional help before the cold sets in.
What You’ll Discover
- The one setting adjustment that saves most homeowners about 15% on winter heating bills
- Why your tank works 40% harder in winter (and what that means for maintenance)
- The 20-minute checklist that catches problems before they become expensive emergencies
- When DIY winterization isn’t enough and you need backup
Check Your Temperature Setting
Start with your thermostat. It’s usually behind a small panel on the side of your tank. Most hot water tanks ship set to 60°C (140°F), which is overkill for winter and burns energy.
Drop it to 49-54°C (120-130°F) for winter. You’ll still get hot showers, but your tank won’t cycle as often to maintain that temperature.
One exception: if anyone in your home has a compromised immune system, keep it at 60°C (140°F). Legionella bacteria can grow in lukewarm water, and it’s not worth the risk.
Insulate Exposed Pipes And The Tank Itself
Cold incoming water is already making your tank work overtime. Don’t make it worse by letting heat escape through exposed pipes or a bare tank.
Grab a tank blanket from any hardware store and wrap it around gas or electric tanks. Follow the instructions – you don’t want to block vents or thermostats. For pipes, use foam insulation sleeves on the first 2 metres (6 feet) of hot water pipes leaving the tank.
The cold water inlet pipe matters too. Insulating it prevents that shocking cold water from dropping your tank temperature too fast.
Drain And Flush The Sediment
This is where most people skip out, and it’s the most important step. Your tank collects sediment all year: minerals, rust, bits of debris from your pipes. In winter, that sediment insulates the heating element from the water, making your tank work 30-40% harder.
Here’s the process: Turn off the power (breaker for electric, gas valve to pilot for gas tanks). Connect a garden hose to the drain valve at the bottom. Run it to a floor drain or outside. Open the valve and let it drain until the water runs clear, usually 5-10 minutes.
You’ll probably see rust-colored water and chunks of sediment. That’s good. That’s exactly what you don’t want sitting in there all winter.
Check The Area Around The Tank
Take two quiet minutes and just look at the tank. Look at the floor first. A small puddle, damp concrete, or a rust streak down the side can point to a slow leak.
Check the pipes where they enter the top of the tank. Green or white crust at a joint often means water has been seeping there for a while. Wipe it clean, then check again in a few days. If it comes back, the joint needs attention.
Keep the space around the tank clear. Boxes and paint cans tucked tight against the unit block airflow and hide leaks. A clear space also makes every other check on this list much easier to do.
Run The Taps And Listen
Once the tank is back up to temperature, run hot water at the tap that sits farthest from the tank. Watch the colour at first. A brief cloudy look can be tiny air bubbles from the flush. Rusty colour that keeps coming is a different story.
Listen while the tank heats again. A quiet hum or a soft burner sound is normal. Loud banging, hissing, or a sharp popping sound is not. Note when the sound happens and how long it lasts. That detail helps a lot if you later describe it over the phone.
Common Winterizing Mistakes
- Turning the power or gas back on before the tank is fully refilled
- Draining the tank without opening a hot water tap first
- Forgetting to reopen the cold water supply after a flush
- Wrapping insulation over vents, controls, or the pressure relief valve
- Setting the temperature higher to make up for slow heating
The refill mistake is the one to watch most. An electric element switched on in an empty tank can burn out in minutes. Always wait for a steady flow of water from an open hot tap before you restore power or relight a gas burner.
When To Call A Pro?
Some winter prep needs professional hands, and knowing the difference saves you from expensive mistakes or dangerous situations.
Call us if your tank is 10+ years old and you’ve never had it serviced. There are anode rods inside that prevent corrosion, and they need replacing roughly every 5 years. Most homeowners have never touched them. If that rod is gone, your tank is literally rusting from the inside.
You’ll also want professional help if you see rust-colored water that doesn’t clear after flushing, hear popping or rumbling noises (that’s sediment buildup so thick it’s kettling), or notice the pilot light going out repeatedly on gas tanks. These aren’t DIY fixes.
The same goes for pressure relief valve testing. That little lever on the side? It’s supposed to release if pressure gets too high. But if it’s never been tested, it might be seized, and testing a seized valve can create a leak you can’t stop. We test these safely and replace them if needed.
If your power bill jumped 20% or more last winter compared to the previous year with similar usage, your tank might be failing. We can run efficiency tests and tell you if it’s worth repairing or time to replace.
Questions about your tank? We’re here to help.
Quick Questions
How often should I do this? Once a year is a good rhythm for most homes. Fall works well because it sets the tank up before the hardest working months arrive.
Can I winterize a tankless unit the same way? No. Tankless units have a different setup and different care steps. Follow the manual for your model, and leave the inside work to a technician.
What if my drain valve drips after I close it? Open it and close it once more. A bit of sediment can sit in the seal. If it still drips after that, the valve likely needs to be replaced.
Should I turn the tank off when I travel in winter? You can lower the setting while you are away. Keep some heat on in the house, though. A cold house puts every pipe at risk, not just the tank.
Bottom Line
Winterizing your hot water tank takes about 30 minutes and saves you from cold showers and emergency repair bills. The temperature adjustment alone cuts your heating costs, and the sediment flush extends your tank’s life by years.
Do this maintenance in November before the cold hits. Your tank will handle winter’s workload without breaking down when you need it most, and you’ll catch small problems before they become big ones.
