Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The Series 200 200 HP doubles the 100 HP's steam output (6,900 vs 3,450 lb/hr), gross output (6,695 vs 3,348 MBH) and heating surface (1,000 vs 500 sq ft) at the same 5 sq ft per HP ratio, adding about 5,450 lb of dry shipping weight and roughly doubling the printed firing rates for gas, LP and oil.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Hurst Series 200 — 100 HP | Hurst Series 200 — 200 HP |
|---|---|---|
| Boiler horsepower | 100 HP | 200 HP |
| Steam output (from & at 212°F) | 3,450 LBS/HR | 6,900 LBS/HR |
| Gross output | 3,348 MBH | 6,695 MBH |
| Heating surface (fireside) | 500 SQ. FT. | 1,000 SQ. FT. |
| Firing rate, gas | 4,200 CFH | 8,400 CFH |
| Firing rate, LP gas | 45.9 GPH | 91.8 GPH |
| Firing rate, No. 2 oil | 30 GPH | 60 GPH |
| Firing rate, No. 5 & No. 6 oil | 28 GPH | 56 GPH |
| Water capacity, steam series (NWL) | 628 gal | 1,274 gal |
| Water capacity, water series (flooded) | 761 gal | 1,547 gal |
| Shipping weight, high pressure (dry) | 12,450 lb | 17,900 lb |
| Shipping weight, low pressure (dry) | 11,100 lb | 16,500 lb |
Hurst's capacity brochure prints the 100 HP row at 3,450 lb/hr steam and 3,348 MBH gross output, and the 200 HP row at 6,900 lb/hr and 6,695 MBH — a near-exact doubling that follows the 5 sq ft per HP heating-surface rule (500 vs 1,000 sq ft).
Firing rates scale the same way: natural gas from 4,200 to 8,400 CFH, LP gas from 45.9 to 91.8 GPH, No. 2 oil from 30 to 60 GPH and No. 5/#6 oil from 28 to 56 GPH. Water capacity rises from 628 to 1,274 gallons (steam series, NWL) and from 761 to 1,547 gallons (water series, flooded).
Dry shipping weight rises from 12,450 to 17,900 lb high pressure (11,100 to 16,500 lb low pressure). Both are two-pass dryback Scotch Marine boilers documented from 15 to 800 HP with pressures to 300 psig, so the choice is a load calculation against the published table.
Hurst Boiler & Welding Co., Inc.
The Hurst Series 200 100 HP is a two-pass dryback Scotch Marine firetube boiler rated 3,450 lb/hr steam output and 3,348 MBH gross output on 500 sq ft of heating surface in Hurst's published capacity table.
Hurst Boiler & Welding Co., Inc.
The Hurst Series 200 200 HP is a two-pass dryback Scotch Marine firetube boiler rated 6,900 lb/hr steam output and 6,695 MBH gross output on 1,000 sq ft of heating surface in Hurst's published capacity table.
Yes — the brochure prints 3,450 vs 6,900 lb/hr steam and 3,348 vs 6,695 MBH gross output, with heating surface doubling from 500 to 1,000 sq ft.
The brochure prints 17,900 lb dry shipping weight high pressure for the 200 HP against 12,450 lb for the 100 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.