Choose water heater capacity from peak hot-water use and equipment performance rather than household size alone.
Tell us what you need—we’ll call you back fast.
Updated 2026-09-18 · CANRO Heating & Cooling
Quick answer: Four people can have very different hot-water needs. A household using staggered showers is not the same as one taking simultaneous showers while filling a large bath. Start with the busiest period of actual use before choosing a storage or tankless water heater.
There is no single tank volume that is right for every family of four. Ask the contractor to explain how the proposed appliance meets your expected demand and what assumptions could change the selection.
List showers, baths and other hot-water uses that overlap. Record approximate timing and duration rather than deliberately running every fixture as a test. Include expected changes, such as another occupant or a bathroom renovation.
Tell the contractor whether the current problem is running out, slow delivery to a fixture or fluctuating temperature. These are different complaints. A larger heater is not automatically the solution to all three.
ENERGY STAR's first-hour rating describes the estimated hot water a fully heated storage heater can deliver over an hour. Ask how the proposed model's rating and recovery characteristics relate to your demand, with units clearly stated.
Avoid comparing an unexplained “gallon” figure from one source with litres or a different gallon convention elsewhere. Request the manufacturer's specification and let the contractor explain the selection using consistent units.
Ask how the proposed model performs at the required temperature rise and simultaneous flow. A headline maximum flow does not establish performance under every incoming-water condition. Provide the uses you expect to run together and request the basis of the recommendation.
Also discuss the installation scope, including the appliance's fuel and electrical needs, venting where applicable, water connections and access. Equipment capacity is only one part of a complete replacement proposal.
Raising a water heater setting can introduce scalding concerns and should not be used as a generic internet fix for insufficient supply. Ask the qualified professional to address safe operating settings and any relevant mixing arrangements for the installation.
If performance has deteriorated, arrange diagnosis before assuming the appliance was always too small. Record when the change began and whether it affects all fixtures. That history can distinguish a new fault from a long-standing demand mismatch.
Give the same brief to every contractor. Ask each to state what demand its proposal is intended to meet and any limitations. Keep the accepted assumptions with the quote so the equipment choice is based on your household's use rather than a generic family-size chart.
Tell CANRO about your equipment, your Greater Vancouver location and the question you need answered.
📞 (604) 359-1081 Contact CANROTechnical 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.
“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.