A clear installation invoice should match your original quote line for line, with equipment, labour, permits, and warranty terms spelled out.
Tell us what you need—we’ll call you back fast.
Quick answer
A gas boiler or water heater installation invoice should list the specific equipment installed, the labour and any venting or gas line work performed, permit and inspection fees if applicable, disposal of the old unit, and warranty terms, matching what was outlined in your original quote. If the final invoice differs from the quote, it should explain why, such as an unforeseen gas line upsizing or venting change discovered once the old unit was removed. Reading it line by line, rather than just checking the total, is how you confirm the work matches what was agreed to.
Need a licensed gas fitter for your hot water / boiler? Call CANRO at (604) 359-1081 — residential natural-gas heating and hot water across Metro Vancouver since 1999.
The first thing worth doing with a final invoice is placing it side by side with the quote you accepted. The equipment listed should match what was quoted, described specifically enough that you can identify it. The scope of labour, venting, and gas line work should also match, and if anything differs, whether it's an added cost or a change in scope, the invoice or an accompanying note should explain why. A reputable contractor flags changes as they come up during the job rather than surprising you with an unexplained line item at the end.
It's reasonable to ask questions if any part of the invoice is unclear, even after the work is done. A company that stands behind its work will walk through the invoice with you without treating the question as an inconvenience.
| Reason | Is it reasonable? |
|---|---|
| Gas line needed upsizing once inspected up close | Reasonable if it was disclosed as a possibility in the quote |
| Venting needed replacing rather than reusing | Reasonable if explained and confirmed with you before proceeding |
| Additional unexplained charges with no description | Worth questioning directly before paying |
| Permit fee not mentioned until the final invoice | Should have been addressed in the original quote |
A good contractor communicates a scope change before completing the work that caused it, not for the first time on the final invoice.
Your final invoice, along with the original quote and any warranty registration confirmation, becomes part of your maintenance and ownership record for the system. It's useful for warranty claims, for future service calls where a technician wants to know what was installed, and for resale, where documented, itemized work supports a buyer's confidence in the system's history.
Contact the contractor directly and ask for a clear explanation of any line item you don't understand or didn't expect. Most discrepancies come down to a change in scope that should have been communicated during the job, and a straightforward conversation usually resolves it. Keep records of that conversation in case you need to reference it later.
Where practical, compare the model information on your invoice against what's actually installed, since this confirms the paperwork matches reality and gives you a reliable reference if you ever need to describe the unit to a different technician down the road. This is a quick check worth doing while the crew is still on-site, so any discrepancy can be resolved immediately rather than discovered weeks later when it's harder to sort out.
Safety note
This article covers general process and paperwork, not a combustion or venting fault, but the same rule always applies around gas equipment: if you ever smell gas or suspect a leak, leave the home first and call FortisBC at 1-800-663-9911 before doing anything else.
Ask for a clear explanation of what changed and why; a reasonable increase should be tied to a specific, disclosed issue found during the work.
Yes, it should be specific enough that you could verify it matches what was quoted and what's physically installed.
No, permit and inspection fees should be addressed in the original quote, either included or clearly stated as separate.
It supports warranty claims, helps future technicians understand what's installed, and is useful documentation if you sell your home.
Ask the contractor to walk through it with you; a legitimate charge should have a clear, understandable explanation.
It should reference the warranty terms and, ideally, confirm whether registration has been completed or what you need to do to register it yourself.
Family-run, TSBC-licensed (gas LGA0043870 · boiler LBP0046450), serving Metro Vancouver homes since 1999. Residential, natural gas only.
Call (604) 359-1081 Email info@canroheat.ca“Canro does an amazing job! Super professional and skilled with everything—boilers, furnaces, and AC. Always a pleasure working with them!”
“Five stars for Canro. We needed a replacement of a 30-year-old boiler. A new high-efficiency unit was installed—clean, professional work.”
“I can’t speak highly enough about George, who was recommended for a boiler service call for my parents’ home. George is excellent.”
25+ years keeping Metro Vancouver homes comfortable. Honest advice, upfront pricing, work that lasts.