Record peak hot-water use, overlapping fixtures and the timing of comfort problems before requesting a water heater replacement proposal.
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Updated 2026-09-18 · CANRO Heating & Cooling
Keep a short hot-water diary before requesting a replacement proposal. Record ordinary use during the household's busiest periods instead of guessing demand from the number of occupants. The diary helps a contractor distinguish capacity needs from a delivery or temperature complaint.
Do not deliberately waste water or run extreme combinations to test the heater. Observe the household's normal routine and explain any occasional use that the new system should accommodate.
Write the date, start time, uses occurring together, approximate durations and what the occupants noticed. Examples of useful observations include a second shower becoming lukewarm, a long wait at one distant tap or temperature changes while another fixture runs.
Keep those symptoms separate. Running out after a busy period is not the same as waiting for hot water at the first use of the day. A larger appliance may not address every delivery complaint.
If fixture flow information is already available from product documents, include it. You do not need to perform a plumbing test or alter the heater's controls to prepare a useful brief.
An illustrative requirement might be “two usual morning showers can overlap without the temperature problem we currently experience.” State whether that is a daily need or an occasional preference. Ask the contractor to explain what the proposed equipment is intended to meet and under which assumptions.
For storage equipment, ENERGY STAR's first-hour rating is a useful performance concept to discuss. For tankless equipment, ask how the proposed model meets the simultaneous demand under the relevant conditions. The diary provides the use pattern; the professional selects and checks suitable equipment.
Note available space, access restrictions and whether you are open to changing appliance type. Ask the proposal to include associated installation work rather than quoting the heater alone. Fuel, electrical, venting and other requirements depend on the actual selection.
Do not raise water temperature as an experiment to make an underspecified system appear adequate. Ask a qualified professional about safe settings and any relevant mixing arrangement.
Give each contractor the same diary and intended outcome. Ask them to identify assumptions or missing information before comparing prices. Keep the accepted demand brief with the final quote so a later question can be discussed against the original design intention.
If an existing system has suddenly lost performance, request diagnosis first. A use diary can support that visit too, without prematurely deciding that replacement is the only answer.
Technical references checked 2026-09-18. The planning examples are illustrative; equipment instructions and project requirements must be checked for your home.
For help with a residential HVAC project in Greater Vancouver, contact CANRO with your equipment details and the question you need answered.
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