Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
Boilers.ca is a brand of ROMA Heating & Cooling · Licensed gas contractor LGA0202903
Comparison
Verdict in brief
The Series 200 500 HP adds 6,900 lb/hr of steam output and 6,696 MBH of gross output over the 300 HP, moving from 1,500 to 2,500 sq ft of heating surface, 28,000 to 39,900 lb dry shipping weight high pressure, and 2,300 vs 1,764 gallons of steam-series water capacity at the same 5 sq ft per HP design rule.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Hurst Series 200 — 300 HP | Hurst Series 200 — 500 HP |
|---|---|---|
| Boiler horsepower | 300 HP | 500 HP |
| Steam output (from & at 212°F) | 10,350 LBS/HR | 17,250 LBS/HR |
| Gross output | 10,042 MBH | 16,738 MBH |
| Heating surface (fireside) | 1,500 SQ. FT. | 2,500 SQ. FT. |
| Firing rate, gas | 12,600 CFH | 21,000 CFH |
| Firing rate, LP gas | 137.7 GPH | 229.5 GPH |
| Firing rate, No. 2 oil | 90 GPH | 150 GPH |
| Firing rate, No. 5 & No. 6 oil | 84 GPH | 140 GPH |
| Water capacity, steam series (NWL) | 1,764 gal | 2,300 gal |
| Water capacity, water series (flooded) | 2,153 gal | 2,915 gal |
| Shipping weight, high pressure (dry) | 28,000 lb | 39,900 lb |
| Shipping weight, low pressure (dry) | 25,250 lb | 38,800 lb |
The brochure prints the 300 HP row at 10,350 lb/hr steam and 10,042 MBH gross output, and the 500 HP row at 17,250 lb/hr and 16,738 MBH, on 1,500 and 2,500 sq ft of heating surface respectively.
Firing rates step from 12,600 to 21,000 CFH natural gas, 137.7 to 229.5 GPH LP gas, 90 to 150 GPH No. 2 oil and 84 to 140 GPH No. 5/#6 oil. Water capacity (steam series, NWL) rises from 1,764 to 2,300 gallons and the flooded water-series figure from 2,153 to 2,915 gallons.
Dry shipping weight rises from 28,000 to 39,900 lb high pressure and from 25,250 to 38,800 lb low pressure, so rigging and foundation planning should follow the larger unit. Both sizes are two-pass dryback Scotch Marine designs within the 15–800 HP series range.
Hurst Boiler & Welding Co., Inc.
The Hurst Series 200 300 HP is a two-pass dryback Scotch Marine firetube boiler rated 10,350 lb/hr steam output and 10,042 MBH gross output on 1,500 sq ft of heating surface in Hurst's published capacity table.
Hurst Boiler & Welding Co., Inc.
The Hurst Series 200 500 HP is a two-pass dryback Scotch Marine firetube boiler rated 17,250 lb/hr steam output and 16,738 MBH gross output on 2,500 sq ft of heating surface in Hurst's published capacity table.
6,900 lb/hr more: 17,250 against 10,350 lb/hr from and at 212°F, per the Series 200 brochure.
The brochure prints 39,900 lb dry shipping weight high pressure against 28,000 lb for the 300 HP.
A consultation includes a heat-loss review so the size is right the first time.
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.