Raypak Delta Limited H8-1259B
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.
Key figures
- Max input
- 1,260 MBH
- Max CSA output
- 1,058 MBH
- AFUE
- —
- Min input
- —
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Raypak Delta Limited H8-1259B in practice
The H8-1259B is the 1,260 MBTUH size of the Delta Limited, Raypak's indoor non-condensing copper-fin boiler based on the same basic design as the Hi Delta with a reduced feature set at reduced cost. The official submittals print 1,260 MBTUH input and 1,058 MBTUH Type H output at 84% thermal efficiency, with 3-stage firing, a 68-1/2 in casing width, 2-1/2" NPT water connections, a 2" NPT gas connection, a 12 in flue, 1010 lb approximate shipping weight and <12 A boiler amp draw.
The model-number key in the I&O manual (241330) reads H for hydronic and the following digit for firing mode — 4 for on-off, 3 for 2-stage, 8 for 3-stage and 9 for 4-stage — which is how the page's H4/H3/H8/H9 prefixes match the printed stage counts. Submittals 242015 (399B-899B) and 242016 (989B-2339B) carry the rating tables above.
Best suited to
- Commercial hydronic loads near 1,260 MBTUH input
- Budget-sensitive plants wanting the Hi Delta design with a reduced feature set
- Indoor installations on Category I or III venting
Applicability and support
- Model number
- H8-1259B
- Canadian availability
- unknown
- Production status
- current
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Not verified
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.
Specifications
Published specifications
Values as published by Raypak. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Input | 1,260 MBH | Rated input 1,260 MBTUH printed in the Delta Limited submittals (242015/242016) and the product page model rows. |
| Output | ||
| Output | 1,058 MBH | Type H (hydronic) output 1,058 MBTUH printed in the Delta Limited submittals at 84% thermal efficiency. |
| Efficiency | ||
| AHRI thermal efficiency | 84 % | 84% Type H thermal efficiency per the Delta Limited submittals and product page model rows. |
| Venting and air | ||
| Flue outlet | 12 in | Flue connection (K) per the Delta Limited submittals. |
| Venting category | Category I & III | Non-condensing Category I or III venting per the product page model rows. |
| Physical and connections | ||
| Width (A) | 68-1/2 in | Dimension A printed in the Delta Limited submittals. |
| Water connection | 2-1/2" NPT | Water connection (H NPT) per the Delta Limited submittals. |
| Gas connection | 2" NPT | Gas connection (G NPT, natural gas) per the Delta Limited submittals; propane connection sizes are printed separately. |
| Weight | 1,010 lb | Approximate shipping weight 1010 lb printed in the Delta Limited submittals. |
| Electrical | ||
| Electrical | 120 VAC, 1-phase; <12 A boiler draw | Operating voltage and boiler amp draw from the Delta Limited submittals and product page model rows. |
| Operating limits and other | ||
| Firing stages | 3 firing stages | Firing stages printed in the Delta Limited submittals; the manual's model-number key maps the first digit (4 = on-off, 3 = 2-stage, 8 = 3-stage, 9 = 4-stage). |
| Turndown | 3:1 | Turndown from the product page model rows, matching the printed firing-stage count. |
| Maximum water flow | 132 GPM | Maximum water flow from the product page model rows. |
| Fuel | Natural gas or propane | Natural gas or propane; the submittals print natural-gas and propane rates. |
Manuals
Alerts documented for this model
None documented yet.
Frequently asked questions
What are the Delta Limited H8-1259B ratings?
The official submittals print 1,260 MBTUH input, 1,058 MBTUH Type H output at 84% thermal efficiency, with 3-stage firing.
What does the model number H8-1259B mean?
The I&O manual's key reads H for hydronic heating and the following digit for firing mode: 4 = on-off, 3 = 2-stage, 8 = 3-stage and 9 = 4-stage, followed by the approximate MBTUH size.
Can the H8-1259B run on propane?
Yes — the submittals print natural-gas and propane rates and connection sizes for this size.
Questions about the Raypak Delta Limited H8-1259B?
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.
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- Delta Limited series hub
- Buying guide
Sources and verification
- Raypak — official site · accessed September 9, 2026
- Raypak — Delta Limited hydronic boiler product page · accessed September 9, 2026
- Raypak — Delta Limited Type H Models 399B-899B product submittal (242015) · accessed September 9, 2026
- Raypak — Delta Limited Type H Models 989B-2339B product submittal (242016) · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.