Engineering Model & Code Compliance Disclaimer:

Thermodynamic modeling, heat recovery yields, and financial metrics generated by this calculator are derived from third-party certified testing protocols under CSA B55.1 and CSA B55.2 (administered by Intertek Testing Services) and align with ASHRAE HVAC Applications Handbook (Service Water Heating) guidelines. Drinking water contact surfaces comply with NSF/ANSI 372 and NSF/ANSI 61 low-lead requirements.

Real-world operational savings, boiler capacity displacement, and simple payback periods will vary based on site-specific mechanical conditions, including seasonal incoming municipal cold water fluctuations, occupant shower diversity and coincidence factors, domestic hot water plant operating thermal efficiency (or heat pump seasonal COP), plumbing hydraulic head loss, and local utility rates. Capital expenditure (CapEx) figures are estimated standard budgetary figures and exclude local structural penetrations, vertical chase alterations, or seismic bracing where required by local plumbing code. This tool is designed solely for preliminary feasibility modeling and does not supersede sealed mechanical engineering drawings, hydraulic pressure-drop calculations, or stamped submittals required for municipal permit issuance, LEED verification, Toronto Green Standard (TGS), BC Energy Step Code, or formal utility incentive pre-approval.