Gas Line
Gas Line
London Ontario
Gas line installation, repair, sizing, and extension across London Ontario and Southwestern Ontario — all performed by a TSSA-certified gas technician as required by Ontario law. New furnace connections, tankless water heater gas supply upgrades, natural gas BBQ lines to decks and garages, gas stove and dryer connections, gas leak diagnosis and repair, and pressure testing after every gas system installation or modification. Natural gas (Enbridge) and propane LP lines. Permit included where required. BBB A+. 138 five-star reviews since 2018.
Why TSSA Certification Matters for Gas Line Work in London Ontario
Gas line work is not a DIY project and not a task for an unlicensed handyperson. Ontario law requires TSSA certification for all gas work — and the consequences of non-compliance go beyond fines.
Gas Work in Ontario Requires a TSSA Licence — Ontario Regulation 212/01
Under Ontario Regulation 212/01 (Technical Standards and Safety Act, 2000), all gas line work in Ontario — installation, modification, repair, or extension — must be performed by a TSSA (Technical Standards and Safety Authority) licensed gas technician. Gas work performed by unlicensed individuals is illegal in Ontario and has three additional consequences homeowners may not consider:
1. Insurance void: A gas line modification or installation performed without TSSA certification voids the home insurance coverage related to that work. If a fire or gas incident occurs, the insurer may deny the claim.
2. No pressure test: TSSA-certified technicians are required to perform a pressure test after every gas installation or modification. Without this test, there is no confirmation that connections are leak-free.
3. No permit: Gas line extensions require a permit in most Ontario municipalities. An unpermitted gas line extension becomes a problem at sale, during renovation, or if discovered by an insurance adjuster.
Gas Line Services Hawana Provides in London Ontario
Every gas line service below is performed by a TSSA-certified technician, pressure-tested after completion, and includes a permit where required by the municipality.
🔥 New Furnace Gas Connection
Connect a new or replacement furnace to the existing gas supply line. Includes flexible connector and dedicated shut-off valve. Part of every Hawana furnace installation. Pressure-tested.
💧 Tankless Water Heater Gas Line
Most tankless water heaters require a 3/4 inch gas supply line. Hawana sizes and upgrades the existing supply line from the gas meter to the new tankless unit. Included in tankless installation quote when needed.
🍳 Gas Stove or Range Connection
Connect a new gas range to an existing gas stub or run a new gas line to a kitchen location adding gas cooking. Flexible connector, shut-off valve, pressure test.
🪕 Gas Dryer Connection
Connect a gas dryer to an existing gas outlet or run a new gas line to the laundry location. Particularly relevant when switching from an electric dryer to gas for lower operating cost.
🔥 Gas Fireplace Connection
New gas supply line to a gas fireplace insert or direct-vent gas fireplace. Includes dedicated shut-off valve. Permit typically required. Pressure-tested.
🔥 Natural Gas BBQ Deck Line
Run a gas line from the house to a deck outlet for a natural gas BBQ — eliminating propane tank exchanges. Ward K.'s review below describes exactly this installation. Permit included.
🏠 Garage Gas Heater Connection
Run a gas supply line to a garage for a gas-fired unit heater. Allows the garage to be heated in a London Ontario winter without electric heaters. Permit required. Pressure-tested.
🔥 Gas Leak Detection and Repair
Calibrated gas detector used to locate leaks at flexible connectors, fittings, valves, and joints. Faulty components replaced. Pressure-tested after repair. If you detect a strong gas smell, call Enbridge first — see the emergency section below.
💇 Gas Line Sizing Upgrade
Upsize an existing 1/2 inch gas supply line to 3/4 inch or larger to support higher-demand appliances. Most commonly required when a tankless water heater or dual-fuel heat pump system is installed on an undersized supply line.
Gas Line Sizing in London Ontario — The Tankless Water Heater Problem
The most common gas line sizing issue Hawana encounters in London Ontario: a 1/2 inch gas supply line that was adequate for a 40-gallon storage tank but is undersized for a tankless water heater at peak demand.
| Appliance | Typical BTU Input | 1/2" Line (up to 10m run) | 3/4" Line (up to 10m run) |
|---|---|---|---|
| Gas furnace — standard | 80,000–100,000 BTU/hr | ✓ Adequate | ✓ Adequate |
| Gas water heater (tank, 40 gal) | 36,000–50,000 BTU/hr | ✓ Adequate | ✓ Adequate |
| Gas stove / range | 50,000–65,000 BTU/hr | ✓ Adequate | ✓ Adequate |
| Gas fireplace insert | 25,000–40,000 BTU/hr | ✓ Adequate | ✓ Adequate |
| Natural gas BBQ (standard) | 40,000–60,000 BTU/hr | ✓ Adequate (short run) | ✓ Adequate |
| Tankless water heater (Navien NPE 240) | 199,900 BTU/hr | ✗ Undersized — upgrade required | ✓ Adequate |
| Furnace (100k) + tankless (200k) on same line | 300,000+ BTU/hr | ✗ Severely undersized | ⚠ Assess — may need 1" line |
The tankless water heater gas line upgrade is included in Hawana's tankless installation quote: Hawana measures the existing gas supply line diameter and calculates the required capacity at every tankless estimate visit. If an upgrade from 1/2 inch to 3/4 inch is needed, it is included in the written installation quote so there is no surprise after the installation begins. Dale B.'s review below describes exactly this scenario — 12 feet of 3/4 inch line added from the gas meter to the mechanical room, included in the quote, no surprises.
Gas Line Materials — Black Iron vs CSST Flexible Gas Tubing
Two materials are used for residential gas lines in Ontario. Each has appropriate applications and installation requirements.
⚌ Black Iron Pipe — Rigid Gas Line
- Standard material for main gas supply lines and long runs
- Threaded fittings — requires cutting and threading at every connection
- More labour-intensive to install than CSST
- No bonding requirement beyond standard grounding
- Not suitable for final flexible connections to appliances
- Highly durable — lasts the life of the building
- Most common in pre-1990 London Ontario homes
- Required where CSST is not permitted by local code
🔌 CSST Flexible Gas Tubing
- Corrugated stainless steel tubing — flexible, faster to install
- Pushes through walls and ceilings without rigid fittings at bends
- Lower labour cost for long or complex runs
- Must be bonded to electrical grounding system
- Bonding prevents lightning-induced electrical arcing through tubing wall
- Improperly bonded CSST has caused fires after lightning strikes
- Hawana ensures proper bonding on all CSST installations
- Requires arc-resistant jacket (TracPipe, CounterStrike) in some applications
Hawana uses both materials appropriately: Black iron pipe for main supply lines where rigid installation is preferred; CSST where the flexibility reduces installation time and cost without compromising safety. Every CSST installation by Hawana includes proper bonding to the electrical grounding system — which is the critical safety requirement that distinguishes a properly installed CSST system from an improperly installed one.
If You Smell Gas in Your London Ontario Home — Call Enbridge First
A strong gas smell is a gas leak emergency. Enbridge Gas responds 24/7 at no charge. Do not call Hawana first — call Enbridge. Here is the correct sequence.
🚨 Gas Smell Emergency — Exact Steps
- Do not turn any electrical switches on or off. Do not use the phone inside the home. Do not create any sparks.
- Leave the home immediately — all occupants and pets. Leave doors open as you exit to allow gas to disperse. Do not stop to collect belongings.
- Call Enbridge Gas at 1-866-763-5427 from outside the home — from a neighbour's home or a mobile phone away from the building. Enbridge responds 24/7 at no charge.
- Do not re-enter the home for any reason until Enbridge has inspected and cleared the building.
- After Enbridge identifies and stops the immediate hazard, call Hawana at (647) 550-4220 for gas line repair, flexible connector replacement, or valve replacement.
Faint or intermittent gas smell: If you detect a faint or intermittent smell that is not a strong ongoing odour, it may be safe to call Hawana for a gas leak diagnostic using a calibrated gas detector. The faint smell near the furnace that Spen T. describes below — which turned out to be a pinhole in the flexible connector — is a typical example. When in doubt, call Enbridge first.
Your TSSA Certified Gas Technician — London Ontario & Southwestern Ontario
Abdullah Ghzail — Lead HVAC Technician & Founder
Abdullah performs gas line installation, repair, sizing, and extension across London Ontario and Southwestern Ontario with TSSA natural gas and LP propane certification — required by Ontario law for all gas work, which means every job is performed to code, pressure-tested after completion, and permitted where required; gas line sizing assessed at every tankless water heater installation because a Navien NPE running on an undersized 1/2 inch supply line runs at reduced capacity and the homeowner never gets what they paid for; and calibrated gas detector used for every leak diagnostic because a faint gas smell deserves a proper diagnosis, not a visual inspection. BBB A+. 138 five-star reviews.
Gas Line Reviews — London Ontario
138 five-star reviews — natural gas BBQ deck line White Oaks (Ward K.), faint gas smell diagnosed as pinhole in flex connector Byron (Spen T.), tankless gas line upgrade 3/4 inch included in quote (Dale B.). Read all ↗
"Had Hawana run a natural gas line to our deck at our White Oaks London home for a natural gas BBQ. The technician assessed the supply line in the basement, confirmed adequate capacity, ran a 3/4 inch line through the basement ceiling and exterior wall to a deck outlet with a lockable valve. Pressure tested, permit handled. The whole job took about 3 hours. Natural gas BBQ: no more propane tank exchanges, full heat every time."
"Called Hawana when I smelled a faint gas odour near our furnace in Byron. He was clear on the phone: if I smelled gas actively, I should call Enbridge first. Since the smell was faint and intermittent, he came for a diagnostic. Used a calibrated gas detector and found a small leak at the flexible connector between the shut-off valve and the furnace. Replaced the connector and the shut-off valve, pressure tested, confirmed leak-free. Professional and reassuring."
"Had Hawana install a Navien tankless water heater. At the estimate, the technician measured the existing gas supply line (1/2 inch), calculated the required flow for the Navien 240, and confirmed a 3/4 inch upgrade was needed — about 12 feet from the gas meter to the mechanical room. The upgrade was included in the installation quote so there was no surprise. Gas line upsized, Navien installed, pressure tested, commissioned the same day. The written quote matching the invoice is not something I have experienced with every contractor."
Gas Line Services — Southwestern Ontario
Natural gas (Enbridge) and propane LP lines. Same standards across the entire service area.
Gas Line FAQ — London Ontario 2026
TSSA certification requirements, services offered, sizing, gas smell emergencies, CSST vs black iron pipe, permits, pressure testing, propane, and shut-off valves.
Gas Line Work in London Ontario?
TSSA certified gas line installation, repair, sizing, and extensions. Natural gas and propane LP. New appliance connections, BBQ deck lines, garage heater lines, tankless gas upgrades, leak repair. Pressure tested. Permits handled. BBB A+. 138 five-star reviews.
More HVAC Services — London Ontario
🔥 Furnace Installation — From $3,400
Gas furnace with TSSA-certified gas connection included. Enbridge $650 rebate.
💧 Navien Tankless — From $3,500
Gas line sizing assessed at every estimate. 3/4" upgrade included when needed.
🌡️ Heat Pumps — HRS $7,500
Dual-fuel system gas line work by TSSA certified technician.
🐥 Gas Tank Water Heater — From $2,700
Gas connection included. Same-day installation. No rental.
🔌 Ductwork Services
Duct repair, sealing, and sizing. Assessed at every new HVAC install.
🔧 Furnace Repair — $175 Diagnostic
Gas valve, gas connections assessed at every furnace diagnostic. 24/7.