Lochinvar Copper-Fin II CHN0502

The Copper-Fin II CHN0502 covers 250 to 500 MBH input with 425 MBH gross output and a 370 MBH AHRI net rating at 85% thermal efficiency on a 6" vent.

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Key figures

Max input: 500 MBH
Max CSA output: —
AFUE: —
Min input: 250 MBH

Natural gasPropaneHeating-onlycommercial

Input is gas energy consumed; output is heat delivered. Never size from input alone.

Lochinvar Copper-Fin II CHN0502 in practice

The CHN0502 is the second Copper-Fin II size: the CHX I&O ratings table lists 250 to 500 MBH input, 425 MBH gross output and a 370 MBH AHRI net water rating at 85% thermal efficiency, with 1.9 gallons of water content. The CHE-Sub-11 submittal prints a 414 lb shipping weight, 6" vent and 6" air inlet on 2" NPT water connections (6-1/2" centers) and a 1-1/4" gas connection.

It keeps the 31-1/2" A and 22-1/4" C cabinet dimensions of the CHN0402 while growing the B dimension to 45-1/2", and it carries the line's SMART SYSTEM control with 8-boiler cascade, proportional firing up to 4:1, Category I/IV venting options and ANSI Z21.13/CSA 4.9 certification. The submittal prints 85% thermal efficiency (AHRI certified) and a 10-year limited warranty with 1-year parts.

Best suited to

Commercial loads near 500 MBH on 2" water piping
Cascaded plants using the SMART SYSTEM sequencer
Projects that want a 6" vent and air inlet at 500 MBH

Applicability and support

Model number: CHN0502
Canadian availability: available
Production status: current
ROMA supplies: Confirmed at consultation
ROMA services: Confirmed at consultation
Warranty: Series terms

Where ROMA provides on-site service

On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.

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Specifications

Published specifications

Values as published by Lochinvar. Units are shown with every value; notes flag conflicting sources or missing figures.

Lochinvar Copper-Fin II CHN0502 specifications
Specification	Value	Note
Input
Heating input, minimum	250 MBH	Per the I&O ratings table.
Heating input, maximum	500 MBH	Per the submittal sheet and the I&O ratings table.
Output
Gross output	425 MBH	Gross output per the submittal sheet ratings table.
Net AHRI water rating	370 MBH	Net AHRI rating based on a piping and pickup allowance of 1.15, per the submittal and I&O ratings-table notes.
Efficiency
Efficiency (thermal)	85 %	85% thermal efficiency (AHRI certified) printed in the CHE-Sub-11 submittal and on the product page; no AFUE is published.
Venting and air
Vent size	6"	Per the submittal and I&O ratings tables.
Air inlet size	6"	Per the CHE-Sub-11 submittal ratings table.
Venting	Category I (Type B double-wall) or Category IV (AL29-4C stainless steel); vertical or horizontal	Per the CHE-Sub-11 standard features and the CHX I&O venting section; DirectAire and powered sidewall options are listed in the submittal.
Physical and connections
Water content	1.9 gal	Per the I&O ratings table.
Space-heating water connections	2"	2" NPT on 6-1/2" centers per the CHE-Sub-11 submittal.
Gas connection	1-1/4"	Per the submittal and I&O ratings tables.
Shipping weight	414 lb	Shipping weight per the submittal sheet ratings table.
Dimension A	31-1/2"	As labeled on the CHE-Sub-11 dimension drawing; dimensions are approximate per the submittal.
Dimension B	45-1/2"	As labeled on the CHE-Sub-11 dimension drawing; dimensions are approximate per the submittal.
Dimension C	22-1/4"	As labeled on the CHE-Sub-11 dimension drawing; dimensions are approximate per the submittal.
Dimension D	12-1/2"	As labeled on the CHE-Sub-11 dimension drawing; dimensions are approximate per the submittal.
Dimension E	7"	As labeled on the CHE-Sub-11 dimension drawing; dimensions are approximate per the submittal.
Dimension F	7"	As labeled on the CHE-Sub-11 dimension drawing; dimensions are approximate per the submittal.
Dimension G	29"	As labeled on the CHE-Sub-11 dimension drawing; dimensions are approximate per the submittal.
Dimension H	6-1/2"	As labeled on the CHE-Sub-11 dimension drawing; dimensions are approximate per the submittal.
Operating limits and other
Firing	Proportional, up to 4:1 turndown	Proportional firing up to 4:1 turndown per the CHE-Sub-11 standard features; the CHX I&O ratings table prints minimum inputs of 250/360/630 MBH by size.

Manuals

Alerts documented for this model

None documented yet.

Services

Related parts & service

Frequently asked questions

What are the CHN0502's ratings?

250 to 500 MBH input, 425 MBH gross output and a 370 MBH AHRI net water rating at 85% thermal efficiency, per the CHE-Sub-11 submittal and the CHX I&O ratings table.

What vent and air sizes does the CHN0502 use?

6" vent and 6" air inlet per the CHE-Sub-11 submittal, with Category I Type B or Category IV AL29-4C stainless steel vent materials.

Questions about the Lochinvar Copper-Fin II CHN0502?

Describe what the boiler is doing and get a straight answer about the next step.

On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.

Call 778-909-5731 Request service

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Sources and verification

Lochinvar — Copper-fin II Commercial Gas Boiler (CHN0402) model page · accessed September 9, 2026
Copper-Fin II Commercial Gas Boilers (CH 402-2072) Submittal Sheet, CHE-Sub-11 · CHE-Sub-11 · accessed September 9, 2026
Copper-Fin II Commercial Gas Boilers (CHX Models only) I&O Manual, Rev A · Rev A · accessed September 9, 2026

Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.