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THE EQUIPMENT GUIDE / Water heating & storage

Tankless water heaters

Size for simultaneous demand and incoming water conditions.

A tankless water heater heats water as it flows through the appliance. Selection depends on the required flow and temperature rise, not simply the number of bathrooms.

Plan the project ↓
HVACR / SYSTEM NOTES01Cold-water supply02On-demand heater03Hot-water fixtures
Tankless water heaters: Cold-water supply / On-demand heater / Hot-water fixtures. Original HVACR.tv conceptual illustration; labels identify project elements, not an installation sequence or construction drawing.

PLANNING / SELECTION / HANDOVER

Before choosing the equipment

List fixtures likely to run together and describe current delays or temperature complaints. Ask how the proposed fuel or electrical supply supports the selected unit.

What belongs in the quote

Include venting where applicable, water treatment considerations and any circulation arrangement. Request expected performance at the site's incoming water conditions.

Think about the surrounding system

Bring the number of users, simultaneous fixtures and any commercial process demand. Ask for a sizing explanation, available energy options and a complete connection scope. The proposal should address placement, service access, drainage and coordination with the plumbing contractor, not just the heater itself.

Three questions for your contractor

  1. What simultaneous flow was assumed?
  2. Are energy-supply upgrades needed?
  3. How will wait time and maintenance be addressed?

Prepare a useful first conversation

Bring the site location, building use, equipment model details and photographs of accessible equipment. Describe the problem or planned change and any access or shutdown constraints. Ask the contractor to identify design assumptions, excluded work, required approvals and who will commission the finished system.

This is a project-planning guide. Final equipment selection and installation details need a qualified contractor or designer familiar with the site.

Continue learning

Natural Resources Canada — heating, cooling and ventilation ↗

Independent background reading. Manufacturer references illustrate equipment categories; HVACR.tv does not claim a dealer relationship or recommend a specific model.

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