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Raypak · Series
The Delta Limited is Raypak's indoor non-condensing copper-fin boiler, based on the Hi Delta design with a reduced feature set at reduced cost, in models from H4-399B to H9-2339B (399–2339 MBH).
Series facts
Raypak describes the Delta Limited as a non-condensing copper-fin boiler 'based on the same basic design as the Hi Delta' but with 'a reduced set of features … at reduced cost', for indoor installation.
Model sizes printed in the documentation rows run H4-399B, H3-499B, H3-649B, H3-749B, H3-899B, H3-989B, H8-1259B, H9-1529B, H9-1799B, H9-1999B, H9-2069B and H9-2339B (399–2339 MBH).
Raypak publishes I&O manual 241330 with an English and a French edition, plus the 1000.57 document, from the product page. As with the other Raypak lines, no explicit Canadian-availability sentence is printed.
Highlights
Models
One canonical page per model with input, output and efficiency kept separate.
The Raypak Delta Limited H4-399B is an indoor non-condensing copper-fin commercial hydronic boiler rated 399 MBTUH input and 335 MBTUH Type H output at 84% thermal efficiency, with 1-stage firing and a 6 in flue.
The Raypak Delta Limited H3-499B is an indoor non-condensing copper-fin commercial hydronic boiler rated 500 MBTUH input and 420 MBTUH Type H output at 84% thermal efficiency, with 2-stage firing and a 6 in flue.
The Raypak Delta Limited H3-649B is an indoor non-condensing copper-fin commercial hydronic boiler rated 650 MBTUH input and 546 MBTUH Type H output at 84% thermal efficiency, with 2-stage firing and a 8 in flue.
The Raypak Delta Limited H3-749B is an indoor non-condensing copper-fin commercial hydronic boiler rated 750 MBTUH input and 630 MBTUH Type H output at 84% thermal efficiency, with 2-stage firing and a 8 in flue.
The Raypak Delta Limited H3-899B is an indoor non-condensing copper-fin commercial hydronic boiler rated 900 MBTUH input and 756 MBTUH Type H output at 84% thermal efficiency, with 2-stage firing and a 8 in flue.
The Raypak Delta Limited H3-989B is an indoor non-condensing copper-fin commercial hydronic boiler rated 990 MBTUH input and 832 MBTUH Type H output at 84% thermal efficiency, with 2-stage firing and a 10 in flue.
The Raypak Delta Limited H8-1259B is an indoor non-condensing copper-fin commercial hydronic boiler rated 1,260 MBTUH input and 1,058 MBTUH Type H output at 84% thermal efficiency, with 3-stage firing and a 12 in flue.
The Raypak Delta Limited H9-1529B is an indoor non-condensing copper-fin commercial hydronic boiler rated 1,530 MBTUH input and 1,285 MBTUH Type H output at 84% thermal efficiency, with 4-stage firing and a 12 in flue.
The Raypak Delta Limited H9-1799B is an indoor non-condensing copper-fin commercial hydronic boiler rated 1,800 MBTUH input and 1,512 MBTUH Type H output at 84% thermal efficiency, with 4-stage firing and a 14 in flue.
The Raypak Delta Limited H9-1999B is an indoor non-condensing copper-fin commercial hydronic boiler rated 1,999 MBTUH input and 1,679 MBTUH Type H output at 84% thermal efficiency, with 4-stage firing and a 14 in flue.
The Raypak Delta Limited H9-2069B is an indoor non-condensing copper-fin commercial hydronic boiler rated 2,070 MBTUH input and 1,739 MBTUH Type H output at 84% thermal efficiency, with 4-stage firing and a 14 in flue.
The Raypak Delta Limited H9-2339B is an indoor non-condensing copper-fin commercial hydronic boiler rated 2,340 MBTUH input and 1,966 MBTUH Type H output at 84% thermal efficiency, with 4-stage firing and a 16 in flue.
| Specification | Raypak Delta Limited H4-399B | Raypak Delta Limited H3-499B | Raypak Delta Limited H3-649B | Raypak Delta Limited H3-749B | Raypak Delta Limited H3-899B | Raypak Delta Limited H3-989B | Raypak Delta Limited H8-1259B | Raypak Delta Limited H9-1529B | Raypak Delta Limited H9-1799B | Raypak Delta Limited H9-1999B | Raypak Delta Limited H9-2069B | Raypak Delta Limited H9-2339B |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| input-min | — | — | — | — | — | — | — | — | — | — | — | — |
| Input | 399 MBH | 500 MBH | 650 MBH | 750 MBH | 900 MBH | 990 MBH | 1,260 MBH | 1,530 MBH | 1,800 MBH | 1,999 MBH | 2,070 MBH | 2,340 MBH |
| Output | 335 MBH | 420 MBH | 546 MBH | 630 MBH | 756 MBH | 832 MBH | 1,058 MBH | 1,285 MBH | 1,512 MBH | 1,679 MBH | 1,739 MBH | 1,966 MBH |
| afue | — | — | — | — | — | — | — | — | — | — | — | — |
| Turndown | 1:1 | 2:1 | 2:1 | 2:1 | 2:1 | 2:1 | 3:1 | 4:1 | 4:1 | 4:1 | 4:1 | 4:1 |
| vent-max-3 | — | — | — | — | — | — | — | — | — | — | — | — |
| vent-max-2 | — | — | — | — | — | — | — | — | — | — | — | — |
| Weight | 445 lb | 545 lb | 590 lb | 675 lb | 740 lb | 900 lb | 1,010 lb | 1,225 lb | 1,350 lb | 1,450 lb | 1,450 lb | 1,520 lb |
Read the full comparison: Raypak Delta Limited H4-399B vs Delta Limited H3-499B →
Read the full comparison: Raypak Delta Limited H3-649B vs Delta Limited H3-749B →
Read the full comparison: Raypak Delta Limited H8-1259B vs Delta Limited H9-1529B →
Read the full comparison: Raypak Delta Limited H9-2069B vs Delta Limited H9-2339B →
Error codes and alerts
No alerts documented for this series yet.
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
Raypak states the Delta Limited is based on the same basic design as the Hi Delta with a reduced set of features, offered at reduced cost, for indoor installations.
The page prints H4-399B, H3-499B, H3-649B, H3-749B, H3-899B, H3-989B, H8-1259B, H9-1529B, H9-1799B, H9-1999B, H9-2069B and H9-2339B.
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.