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 PHTM2150H and PHTM2180H are the two large-cabinet Phantom II heat-only sizes: identical 95.0% AFUE, 10:1 modulation, 20.4 × 17.8 × 29.8 inch cabinet, 132 lb shipping weight and 1.0 gal water content. The 2180H adds 30 MBH of input ceiling (180 vs 150 MBH), lifting DOE capacity from 141 to 169 MBH and net AHRI from 123 to 147 MBH, with the same 20 MBH minimum fire.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Crown Phantom II PHTM2150H | Crown Phantom II PHTM2180H |
|---|---|---|
| Input, minimum | 20 MBH | 20 MBH |
| Input, maximum | 150 MBH | 180 MBH |
| DOE heating capacity | 141 MBH | 169 MBH |
| Net AHRI water rating | 123 MBH | 147 MBH |
| Efficiency (AFUE) | 95 % | 95 % |
| Turndown ratio | 10:1 | 10:1 |
| Boiler water content | 1 gal | 1 gal |
| Shipping weight | 132 lb | 132 lb |
| Dimensions (D × W × H) | 20.4" × 17.8" × 29.8" | 20.4" × 17.8" × 29.8" |
| Max. equivalent vent length, 2" | 70 ft | 70 ft |
| Max. equivalent vent length, 3" | 135 ft | 135 ft |
| Heating water connections | 1" sweat | 1" sweat |
| Gas connection | 1/2" MPT | 1/2" MPT |
| Maximum allowable working pressure (MAWP) | 50 psig | 50 psig |
| Electrical | 120 VAC, 60 Hz, 1-phase, 1.8 A | 120 VAC, 60 Hz, 1-phase, 1.8 A |
| Fuel | Natural gas or LP | Natural gas or LP |
| Domestic hot water | Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater | Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater |
Both models share the large 20.4 × 17.8 × 29.8 inch cabinet at 132 lb shipping with 1.0 gal of water content, the same 20 MBH minimum fire, 1" sweat supply/return, 1/2" MPT gas, 50 psig MAWP and 2"/3" venting to 70/135 ft — all at 95.0% AFUE on the gas-adaptive 'PHTM II' control.
The 2180H exists purely for top-end capacity: its 180 MBH maximum input prints 169 MBH DOE heating capacity and a 147 MBH net AHRI water rating, against the 2150H's 150 MBH maximum, 141 MBH DOE and 123 MBH net AHRI.
Because both fire down to the same 20 MBH minimum, low-load behaviour is identical — the choice is entirely whether the heat-loss calculation plus recovery demand approaches 141 MBH of DOE capacity (2150H) or 169 MBH (2180H). On LP above 8,000 ft both are limited to 50 ft equivalent vent length.
Crown Boiler Co.
The Crown Phantom II PHTM2150H fires 20 to 150 MBH at 95.0% AFUE with 141 MBH DOE heating capacity and a 123 MBH net AHRI rating, stepping to the deeper 20.4-inch cabinet at 132 lb shipping.
Crown Boiler Co.
The Crown Phantom II PHTM2180H is the largest Phantom II heat-only boiler: 20 to 180 MBH input at 95.0% AFUE with 169 MBH DOE heating capacity and a 147 MBH net AHRI rating, in the same 132 lb large cabinet as the 2150H.
Only top-end capacity: 150 vs 180 MBH maximum input, 141 vs 169 MBH DOE heating capacity and 123 vs 147 MBH net AHRI. Cabinet, weight, minimum fire and connections are identical.
Yes — 2" to 70 ft or 3" with increaser to 135 ft, with both limited to 50 ft equivalent on LP above 8,000 ft.
The one a heat-loss calculation supports. Since both start at 20 MBH minimum fire, extra ceiling you never use buys nothing except more boiler than the load needs.
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 8, 2026. Last updated September 8, 2026. Technical reviewer: not yet assigned.