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Raypak · Series
The MVB Category I & III is the non-condensing member of Raypak's modulating vertical MVB boiler platform — models H7-504A through H7-2004A with Category I or III venting and public English/French I&O documentation.
Series facts
The MVB Category I and III is the non-condensing version of Raypak's MVB modulating vertical boiler platform: the same vertical modulating design but vented as a Category I or III appliance rather than condensing Category IV.
Model sizes printed in the documentation rows are H7-504A, H7-754A, H7-1104A, H7-1504A and H7-2004A (the 504A–2004A family). Efficiency figures are published in spec sheets rather than the captured page text.
Raypak publishes I&O manual 241512 with English and French editions for the Category I & III models. No explicit Canadian-availability sentence is printed on the page.
Highlights
Models
One canonical page per model with input, output and efficiency kept separate.
Raypak
The Raypak MVB H7-504A is a non-condensing modulating vertical commercial hydronic boiler rated 500 MBTUH input and 420 MBTUH output at 84% thermal efficiency, with Category I & III venting and a 8 in flue.
Raypak
The Raypak MVB H7-754A is a non-condensing modulating vertical commercial hydronic boiler rated 750 MBTUH input and 630 MBTUH output at 84% thermal efficiency, with Category I & III venting and a 10 in flue.
Raypak
The Raypak MVB H7-1104A is a non-condensing modulating vertical commercial hydronic boiler rated 1100 MBTUH input and 924 MBTUH output at 84% thermal efficiency, with Category I & III venting and a 10 in flue.
Raypak
The Raypak MVB H7-1504A is a non-condensing modulating vertical commercial hydronic boiler rated 1500 MBTUH input and 1260 MBTUH output at 84% thermal efficiency, with Category I & III venting and a 12 in flue.
Raypak
The Raypak MVB H7-2004A is a non-condensing modulating vertical commercial hydronic boiler rated 1999 MBTUH input and 1679 MBTUH output at 84% thermal efficiency, with Category I & III venting and a 14 in flue.
| Specification | Raypak MVB H7-504A | Raypak MVB H7-754A | Raypak MVB H7-1104A | Raypak MVB H7-1504A | Raypak MVB H7-2004A |
|---|---|---|---|---|---|
| input-min | — | — | — | — | — |
| Input | 500 MBH | 750 MBH | 1,100 MBH | 1,500 MBH | 1,999 MBH |
| Output | 420 MBH | 630 MBH | 924 MBH | 1,260 MBH | 1,679 MBH |
| afue | — | — | — | — | — |
| Turndown | 1.7:1 | 1.7:1 | 1.7:1 | 1.7:1 | 1.7:1 |
| vent-max-3 | — | — | — | — | — |
| vent-max-2 | — | — | — | — | — |
| Weight | 600 lb | 670 lb | 720 lb | 780 lb | 940 lb |
Read the full comparison: Raypak MVB H7-504A vs MVB H7-754A →
Read the full comparison: Raypak MVB H7-754A vs MVB H7-1104A →
Read the full comparison: Raypak MVB H7-1104A vs MVB H7-1504A →
Read the full comparison: Raypak MVB H7-1504A vs MVB H7-2004A →
Error codes and alerts
Manuals
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.
Services for Raypak boilers
The Category IV models are condensing boilers with Category IV venting; the Category I & III models are the same modulating vertical platform in non-condensing form with Category I or III venting.
The product page prints H7-504A, H7-754A, H7-1104A, H7-1504A and H7-2004A.
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.
Sources and verification
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.