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Rinnai service

Rinnai: measure the peak, then size the heater: the demand assessment

A structured count of how much hot water your household actually uses at the busiest hour, so the tank is sized by first-hour delivery and the tankless unit by flow at the winter rise, never by house size or bedroom count.

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Free written estimate

Free in-home estimates for water-heater replacements and installations, as published by CANRO. Source, checked September 7, 2026.

Where CANRO provides on-site service

On-site service is currently offered across Metro Vancouver: Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Delta, Langley, Port Moody, Port Coquitlam, Maple Ridge, Pitt Meadows, White Rock, Tsawwassen; plus Anmore, Belcarra, Lions Bay, Bowen Island, Abbotsford with travel or ferry arrangements confirmed by phone. Everything else on this site is reference information you can use anywhere in Canada.

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Hot-Water Demand Assessment for Rinnai water heaters

Most water heaters are replaced at the size of the one that failed, and most of those were never sized at all. A demand assessment counts the people, the fixtures that run at once, the shower and tub flows, and the hour of the week when demand peaks, then reads that peak against first-hour ratings or flow-at-rise tables from the published catalogue.

The assessment also catches the non-heater issues that look like demand problems, such as a broken dip tube or a recirculation crossover that wastes heat. It is included in every CANRO consultation and written estimate, and it is the right first step before any replacement or conversion.

Working on a Rinnai unit? Have the model number from the rating plate and any code or flash pattern ready. Browse Rinnai series, models and fault codes to find yours; the details carry through when you request service.

What's included

  • Fixture and simultaneous-use count
  • Peak-hour demand estimate
  • Reading against published first-hour and flow-at-rise ratings
  • Recommendation with the honest margin of error

Not included

  • Binding sizing for multi-unit plants (site assessment with the building engineer where required)

Process

How it works

  1. 01

    Answer the questions

    The estimator's demand questions are the starting point.

  2. 02

    Site count

    The technician counts real fixtures and flows on the visit.

  3. 03

    Size

    The recommendation names the rating that fits your peak.

Why CANRO

4.9★

4.9 from 85+ Google reviews

As published by CANRO Heating & Cooling on canroheat.ca, checked September 7, 2026.

Technical Safety BC licensed gas contractor

Gas-fitting licence LGA0043870 and boiler licence LBP0046450, as published by CANRO.

Source: canroheat.ca

Serving Metro Vancouver since 1999

Founded by George in 1999, as stated on canroheat.ca. Boiler and hydronic expertise is CANRO's, not this domain's.

Source: canroheat.ca

Red Seal HVAC, WorkSafeBC and liability insured

As stated on canroheat.ca. Bonding and association memberships: not published.

Source: canroheat.ca

Frequently asked questions

Why does my 40 gallon tank run out?

Either the peak exceeds the first-hour rating, or a fault such as a broken dip tube is short-circuiting cold water. The assessment separates sizing from faults.

Is the assessment free?

Demand assessment is part of CANRO's free consultations and free written estimates for replacements and installations.

Request a consultation

CANRO reviews your hot-water demand, equipment and installation constraints. Requests are confirmed by CANRO.

On-site service in Metro Vancouver, BC. Call to check availability.

Call 604-359-1081Request a consultation

Related services and help

Sources and verification

Facts checked September 7, 2026. Last updated September 7, 2026. Technical reviewer: not yet assigned.

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