This is probably the question we get asked most after poly-B. Your hot water tank is dying, or you're renovating anyway, and now you're staring at two options online with wildly different price tags and no idea which one actually fits your house.
Short answer: there's no universal right choice. It comes down to your household, your existing setup, and your budget. Here's how to think it through.
How each one actually works
A tank water heater does what it sounds like — it keeps 40 to 60 gallons of water heated and ready to go at all times, so when you turn on the tap, hot water's already sitting there waiting.
A tankless heater doesn't store anything. Cold water runs through it, gets heated by a gas burner or electric element on the spot, and comes out the other end hot — only when you're actually using it.
Tank
Simple and proven
- Lower upfront cost, usually $1,800–$3,200 installed
- 10–12 year typical lifespan
- Can run out of hot water with heavy back-to-back use
- Takes up floor space — usually a closet or utility room
Tankless
Efficient and compact
- Higher upfront cost, usually $4,000–$6,500 installed
- 15–20 year typical lifespan
- Endless hot water — no running out mid-shower
- Wall-mounted, frees up floor space
The differences that actually matter
Past the sales pitch, here's what tends to actually decide it for most homeowners:
- Household size: A family of 4–5 running showers, laundry, and dishes at the same time will feel a tank run out. Tankless keeps up.
- Energy bills: Tankless only heats water when it's being used, so you're not paying to keep a full tank hot 24/7. Most homeowners see a noticeable drop on gas or electric bills.
- Space: Tankless units mount on a wall and are about the size of a suitcase. If you're short on utility room space, that matters.
- Upfront budget: A tank is the cheaper install today. Tankless costs more now but tends to pay some of that back over its longer life.
- Existing setup: If you already have gas and proper venting in place, a gas tankless swap is straightforward. If you're on electric with an older panel, that changes the math — more on that below.
Watch for this: Switching from a tank to gas tankless often means upsizing the gas line and adding new venting — that's not always included in the sticker price you see advertised. Ask for a full quote that includes venting and gas line work up front, not just the unit and labour.
Gas or electric?
Most Kelowna homes we work on are already set up for gas, which makes a gas tankless swap fairly simple. Electric tankless units pull a lot of power — often more than an older panel can handle without an upgrade, which adds cost. If you're on electric and considering tankless, that's the first thing we check during the estimate.
Good to know: Any gas water heater install needs to be done under a Technical Safety BC licence — it's not optional, and it's not something a handyman can legally sign off on. We're licensed for exactly this, and every install is permitted and inspected properly.
So which one's right for your home?
As a rough guide: if you're on a tighter budget, live alone or as a couple, and just need your existing tank replaced like-for-like, a tank is usually the practical call. If you've got a bigger household, you're sick of running out of hot water, or you're renovating and want to free up space, tankless is worth the extra upfront cost.
Either way, we don't push one over the other. We'll look at your household, your existing gas or electric setup, and your budget, and tell you straight which one makes sense — not just sell you the more expensive unit.