Raypak Hi Delta SS HD301
The Raypak Hi Delta SS HD301 is a compact non-condensing copper finned-tube commercial hydronic boiler rated 299 MBTUH input and 251 MBTUH output at 85% AFUE, with a 5 in flue and a 250 lb shipping weight per submittal 241922.
Key figures
- Max input
- 299 MBH
- Max CSA output
- 251 MBH
- AFUE
- —
- Min input
- —
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Raypak Hi Delta SS HD301 in practice
The HD301 is the 299 MBTUH size of the Hi Delta SS, the compact non-condensing copper finned-tube line with cast-iron headers. Product submittal 241922 prints 299 MBTUH input, 251 MBTUH output at 85% AFUE, a 31-9/16 in by 15-3/4 in casing, a 5 in flue connection, 250 lb approximate shipping weight and a maximum flow of 44 gpm with a 13 gpm minimum-flow basis.
The line is documented by I&O manual 241356 and specifications 100-10000170, with the model inventory H3-HD151 through H3-HD401 and outdoor R-model variants (H3-HD101R through HD-HD401R) listed on the product page. Indoor and outdoor models share the sub-6.9 ft footprint Raypak prints for the line.
Best suited to
- Commercial hydronic loads near 299 MBTUH input
- Tight mechanical rooms where the sub-6.9 ft Hi Delta SS footprint matters
- Small plants replacing an existing HD-series boiler
Applicability and support
- Model number
- HD301
- 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 | 299 MBH | Rated input 299 MBTUH printed in the 241922 product submittal. |
| Output | ||
| Output | 251 MBH | Rated output 251 MBTUH printed in the 241922 submittal. |
| Efficiency | ||
| Thermal efficiency | 85 % | Efficiency printed in the 241922 submittal: HD151-HD301 are 85% AFUE and the HD401 is 84% thermal efficiency. |
| Venting and air | ||
| Flue outlet | 5 in | Flue connection (K) per the 241922 submittal. |
| Venting category | Category I | Atmospheric non-condensing venting; the product page lists indoor and outdoor R-model variants. |
| Physical and connections | ||
| Width (A) | 31-9/16 in | Dimension A printed in the 241922 submittal. |
| Height (B) | 15-3/4 in | Dimension B printed in the 241922 submittal. |
| Weight | 250 lb | Approximate shipping weight 250 lb printed in the 241922 submittal. |
| Electrical | ||
| Electrical | <5 A boiler draw, 120 V class | Boiler amp draw printed in the 241922 submittal; pump amps are excluded. |
| Operating limits and other | ||
| Maximum water flow | 44 GPM | Maximum water flow from the 241922 submittal's flow table; minimum flow basis is 13 gpm. |
| Fuel | Natural gas or propane | Natural gas or propane; the 241922 submittal rates the models for both fuels. |
Manuals
Alerts documented for this model
None documented yet.
Frequently asked questions
What are the Hi Delta SS HD301 ratings?
Product submittal 241922 prints 299 MBTUH input, 251 MBTUH output at 85% AFUE, with a maximum flow of 44 gpm.
Is the HD301 available for outdoor installation?
Raypak lists indoor H3-HD models and outdoor R variants (H3-HD101R through HD-HD401R) for the Hi Delta SS; outdoor units use the corresponding R model number.
Which manual covers the Hi Delta SS?
Raypak publishes I&O 241356 for the H WH HD151-HD401 models, plus specifications 100-10000170 and submittal 241922.
Questions about the Raypak Hi Delta SS HD301?
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
- Raypak — official site · accessed September 9, 2026
- Raypak — Hi Delta SS hydronic boiler product page · accessed September 9, 2026
- Raypak — Hi Delta SS Type H Models HD151-HD401 product submittal (241922) · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.