Tankless Water Heaters
Tankless Water Heater
Installation Ontario
Hawana HVAC Solutions installs natural gas tankless water heaters across London Ontario and Southwestern Ontario — Navien NPE series, Rinnai RU series, and Rheem RTG series from $3,500, fully installed with gas line upgrade if required, venting, and commissioning. Endless hot water for households that have run out of capacity with a conventional tank; 15 to 30 percent lower gas consumption than a tank heater; 15 to 20 year lifespan versus 8 to 12 for a tank. Combo furnace and tankless from $6,500 — one visit, one permit, one gas line run. No rental ever. No monthly fee. 24/7 zero after-hours surcharge. TSSA certified. BBB A+. 138 five-star reviews.
Tankless Water Heater Installation Prices — Ontario 2026
Published before you call. Every quote includes gas line assessment and upgrade if required. No hidden disposal fee. No rental.
Navien NPE Series
- NPE-180S or NPE-240S — sized to your home
- Self-modulating burner — 0.97 UEF highest efficiency
- Built-in recirculation pump option — instant hot water
- Stainless steel primary + secondary heat exchangers
- Gas line upgrade 3/4 inch included if required
- Venting — direct-vent PVC through wall
- No rental · No monthly fee · Outright
Rinnai RU Series
- RU199iN — 199,000 BTU max output
- Ultra-low NOx burner — 14 ppm NOx
- ThermaCirc360 recirculation compatible
- Excellent cold-climate performance for Ontario winters
- Gas line upgrade 3/4 inch included if required
- No rental · No monthly fee · Outright
Combo: Furnace + Tankless
- Furnace (gas from $3,400) + Tankless (from $3,500)
- One visit — one permit — one gas line run
- Lower combined labour vs two separate jobs
- Enbridge $650 rebate on furnace portion (95%+ AFUE)
- Tankless portion does NOT qualify for Enbridge rebate
- No rental on either unit · Outright only
All prices CAD, fully installed. Include gas line upgrade to 3/4 inch if required, new venting, commissioning, old unit removal. No disposal fee. No rental. No monthly fee. 24/7 zero surcharge. Call (647) 550-4220.
How a Tankless Water Heater Works — Technical Explainer
Understanding how tankless differs from a tank heater helps you evaluate whether it's the right upgrade for your household. The key difference: on-demand heating with no standby loss.
On-Demand Heating — No Standby Loss
A conventional tank water heater keeps 40 to 60 gallons of water hot at all times — 24 hours a day, 365 days a year, whether you are using hot water or not. This continuous heating to maintain tank temperature is called standby heat loss, and it accounts for 15 to 30 percent of a household's hot water energy consumption. A tankless unit fires only when a hot water tap is opened. The moment the tap closes, the burner stops. Zero standby loss.
Modulating Burner — Precise Temperature Control
A tankless water heater contains a modulating gas burner and a heat exchanger. When cold water flows through, a flow sensor detects movement and signals the burner to fire. The burner modulates — adjusting its output between minimum and maximum BTU — to maintain the set output temperature within 1 to 2 degrees Celsius regardless of flow rate changes. Modern units like the Navien NPE series modulate between approximately 11,000 and 199,000 BTU per hour.
Gas Line Requirement — Why 3/4 Inch Matters
A conventional 40-gallon tank water heater typically draws 36,000 to 50,000 BTU per hour from a 1/2 inch gas line. A tankless unit at full output draws up to 180,000 to 199,000 BTU per hour — four to five times the BTU demand. A 1/2 inch gas supply line cannot deliver sufficient gas pressure and volume at that demand. The 3/4 inch upgrade is not optional for most tankless installations and is included in every Hawana estimate upfront — no surprise cost at install time.
Venting — PVC Direct-Vent Replaces Chimney B-Vent
Most older tank water heaters vent through a B-vent metal chimney flue. Modern condensing tankless units (like all Navien NPE and Rinnai RU models) are direct-vent: they use a concentric PVC pipe — inner pipe for exhaust, outer pipe for combustion air intake — that terminates through an exterior wall, not up a chimney. This is simpler and more efficient, but does require a new wall penetration. The chimney flue is capped. Hawana includes venting in every installation quote.
Tankless Water Heater — Flow Path
1. Cold Water Inlet
London Ontario municipal water enters at 4–10°C in winter. Flow sensor detects movement and triggers the burner to fire.
2. Primary Heat Exchanger
Modulating burner fires between 11,000 and 199,000 BTU/hr. Water passes through stainless steel coils and absorbs heat rapidly.
3. Secondary Heat Exchanger
Navien NPE series condenses flue gases, recovering latent heat and achieving 0.97 UEF — the highest efficiency rating available.
4. Hot Water Outlet
Water exits at set temperature (typically 49°C) within seconds of flow starting. Maintains that temperature regardless of other simultaneous draw points.
5. Direct-Vent PVC
Flue gases exhaust through concentric PVC pipe through exterior wall. No chimney required. Combustion air drawn from outdoors through outer pipe.
Tankless Water Heater Sizing — GPM Guide for Ontario Homes
Sizing a tankless unit means calculating the peak concurrent hot water demand in gallons per minute (GPM) and accounting for Ontario's cold winter inlet water temperatures. Hawana does this calculation for every installation at no charge.
| Fixture or Appliance | Typical GPM | Notes |
|---|---|---|
| Standard shower | 1.5–2.0 GPM | Low-flow showerhead 1.5 GPM; standard 2.0 GPM |
| Dishwasher | 1.0–1.5 GPM | Only during fill cycles — intermittent |
| Kitchen faucet | 1.0–1.5 GPM | Standard aerator; hot-side draw |
| Bathroom faucet | 0.5–1.0 GPM | Low-flow typically 0.5 GPM |
| Clothes washer (hot cycle) | 1.5–2.0 GPM | Depends on washer type |
| Soaker tub / large bathtub | 4.0–6.0 GPM | High draw — size the unit for this if you use it |
| Typical 3-bed London home (worst case simultaneous) | 5–7 GPM | 2 showers + dishwasher + faucet = 5–7 GPM |
Ontario winter temperature rise: London Ontario municipal water arrives at approximately 4–8°C in January. To deliver 49°C at the tap, the unit must raise water temperature by 41–45°C. At that temperature rise, a 180,000 BTU unit delivers approximately 7 GPM and a 199,000 BTU unit delivers approximately 8 GPM. In summer, inlet water is warmer (14–18°C) and the same unit can deliver 9–11 GPM. Always size for winter. Every Hawana tankless estimate includes a free flow-rate calculation based on your home's fixtures and simultaneous usage patterns.
Navien vs Rinnai vs Rheem — Tankless Comparison for Ontario Homes
All three are excellent for Ontario natural gas applications. The differences come down to recirculation, efficiency rating, and pricing. Hawana installs all three and recommends based on your specific needs.
| Feature | Navien NPE-240S | Rinnai RU199iN | Rheem RTG-84DVLN |
|---|---|---|---|
| Hawana installed price | From $3,500 | From $3,800 | From $3,600 |
| Max BTU output | 199,000 BTU/hr | 199,000 BTU/hr | 180,000 BTU/hr |
| UEF efficiency rating | 0.97 — Highest | 0.96 | 0.93 |
| Built-in recirculation pump | Yes — NPE series | No (external pump needed) | No |
| Cold climate performance | Excellent | Excellent | Good |
| Heat exchanger material | Stainless steel (dual) | Copper | Copper |
| Self-modulating burner | Yes | Yes | Yes |
| Parts availability Canada | Excellent | Excellent | Good |
| Best for | Households wanting instant hot water at tap | Reliability-first, low NOx | Budget-conscious, simpler install |
Hawana's recommendation for most London Ontario homes: Navien NPE-240S from $3,500 — the built-in recirculation pump eliminates the cold-water-sandwich problem (a common complaint with tankless units where a brief burst of cold water appears between hot draws) without requiring a separate pump installation. For households where recirculation is not a priority, the Rinnai RU199iN from $3,800 is equally reliable with excellent cold-climate performance.
⚠️ No rental — the financial case: Several Ontario companies (Direct Energy, Reliance Home Comfort, Union Gas subsidiaries) offer tankless water heater rentals at $40 to $60 per month. Over 10 years that is $4,800 to $7,200 — for a unit Hawana installs outright from $3,500. Rental contracts typically include escalation clauses, buyout penalties, and restrict you to one brand. Hawana: outright purchase, financing available, no monthly fee, no auto-renewal, no contract.
Tankless vs Tank Water Heater — Ontario 2026 Decision Guide
Neither is universally better. Here is the honest comparison Hawana gives every homeowner at the estimate visit.
💧 Tankless — Choose If…
- Your household runs out of hot water with the current tank
- You have 3 or more people regularly showering simultaneously
- You want 15–30% lower gas consumption than a tank
- You plan to stay in the home 7+ years (payback period)
- You have space for the smaller wall-mounted unit
- You are replacing both furnace and water heater (combo saves on labour)
- You want a 15–20 year lifespan vs 8–12 years for a tank
🐥 Tank — Choose If…
- Lower upfront cost is the priority (tank from $2,700 vs tankless from $3,500)
- Your household is 1–2 people with modest hot water demand
- The existing gas line cannot be easily upgraded to 3/4 inch
- You are renting the property and may not stay long enough for payback
- You want the simplest possible installation
- The mechanical room has a chimney already connected to the tank vent
Both quoted at the same estimate visit: Hawana provides tankless and tank quotes side by side at every estimate — published pricing for both, gas line assessment for both, and honest advice about which makes more financial sense for your specific household. The estimate visit is free. Call (647) 550-4220.
Tankless Water Heater Installation — What Happens on Install Day
Standard replacement of an existing tank with a tankless unit: 3 to 5 hours. One visit. No second site visit needed.
Remove Old Tank
Existing tank drained, disconnected from gas and water lines, and removed from premises. Included at no disposal charge.
Gas Line Upgrade
3/4 inch gas supply run from the meter or main line to the new unit location. TSSA certified work. Included in quoted price if required.
Mount & Connect Unit
Tankless unit wall-mounted. Cold water inlet and hot water outlet connected. Condensate drain connected where required.
New Venting Run
Concentric PVC direct-vent pipe run through exterior wall. Old chimney B-vent capped. Typical run: 10 to 30 feet.
Commission & Test
Gas leak test, water flow test, temperature set to 49°C, error code check, homeowner walk-through on maintenance requirements.
Your Tankless Water Heater Installation Specialist — Southwestern Ontario
Abdullah Ghzail — Lead HVAC Technician & Founder
Abdullah installs Navien, Rinnai, and Rheem tankless water heaters across London Ontario and Southwestern Ontario — including the gas line upgrade to 3/4 inch that most tankless installations require but many installers quote separately after the fact, and including the new PVC direct-vent through the exterior wall that replaces the chimney B-vent most aging tanks use, so the final invoice matches the written quote. Combo furnace and tankless from $6,500 for homeowners replacing both systems simultaneously. Annual descaling maintenance from $149 per year. No rental ever. No monthly subscription. 24/7 zero after-hours surcharge. TSSA certified. BBB A+. 138 five-star reviews.
Tankless Water Heater Reviews — Southwestern Ontario
138 five-star Google reviews — London family never runs out of hot water after Navien install, Byron combo furnace and tankless with honest Enbridge rebate advice, Byron tenant who switched from rental to outright Rinnai. Read all ↗
"Replaced a 12-year-old 50-gallon tank with a Navien NPE-240S. Tired of running out of hot water with three teenagers. Hawana had the price from $3,500 on the website — the only company in London that published a number. The technician found our 1/2 inch gas line was insufficient — quoted the 3/4 inch upgrade in the same written estimate, no surprise at install time. Installed in four and a half hours including the gas line upgrade. No rental. Invoice matched the written quote to the dollar. We have not run out of hot water once since."
"Combo furnace and Navien tankless in Byron — both the 18-year-old furnace and 14-year-old tank were due for replacement. Hawana quoted the combo from $6,500 — less than two separate jobs. One visit, one permit. The technician made clear upfront that the tankless does not qualify for the Enbridge $650 rebate — only the furnace does. Another company had told me the entire combo qualified. That honesty was the deciding factor. No rental on either unit. Invoice matched exactly."
"Rinnai RU199iN to replace a rented tank from a rental company. Hawana advised us to check our rental contract for buyout terms first — good advice because there was a clause we needed to address. Once sorted, Rinnai installed in about four hours including a new venting run through the side wall. No rental on the new unit — outright ownership from day one. Technician explained the annual descaling and why it matters for London water hardness. Maintenance plan signed up at same visit. Invoice matched exactly."
Tankless Water Heater Installation — Southwestern Ontario
Same published pricing across the entire service area. No travel surcharge.
Tankless Water Heater FAQ — Ontario 2026
Every question Ontario homeowners ask about tankless water heater cost, how they work, GPM sizing, gas line requirements, Navien vs Rinnai, Enbridge rebates, and maintenance.
Ready for Tankless Hot Water in Ontario?
From $3,500 fully installed — gas line upgrade included if needed, venting included, old unit removed. Navien, Rinnai, Rheem. Combo furnace + tankless from $6,500. No rental. No monthly fee. TSSA certified. BBB A+. 138 five-star reviews. 24/7 zero surcharge.
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