Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The PHTM2120H and PHTM2150H are both 95.0% AFUE Phantom II heat-only boilers, but the 2150H moves to the deeper 20.4 × 17.8 × 29.8 inch cabinet: input rises from 13.6–120 to 20–150 MBH, DOE capacity from 112 to 141 MBH and net AHRI from 97 to 123 MBH, with shipping weight growing from 112 to 132 lb and the minimum fire from 13.6 to 20 MBH.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Crown Phantom II PHTM2120H | Crown Phantom II PHTM2150H |
|---|---|---|
| Input, minimum | 13.6 MBH | 20 MBH |
| Input, maximum | 120 MBH | 150 MBH |
| DOE heating capacity | 112 MBH | 141 MBH |
| Net AHRI water rating | 97 MBH | 123 MBH |
| Efficiency (AFUE) | 95 % | 95 % |
| Turndown ratio | 10:1 | 10:1 |
| Boiler water content | 0.75 gal | 1 gal |
| Shipping weight | 112 lb | 132 lb |
| Dimensions (D × W × H) | 16.3" × 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 are stainless steel condensing, direct-vent Phantom II heat-only boilers on the gas-adaptive 'PHTM II' control with 10:1 modulation, 2"/3" venting to 70/135 ft, 1" sweat supply/return, 1/2" MPT gas and 50 psig MAWP at 95.0% AFUE.
The 2150H lifts input to 20–150 MBH for 141 MBH DOE heating capacity and a 123 MBH net AHRI water rating, against the 2120H's 112 MBH DOE and 97 MBH net over a 13.6–120 MBH input range.
The cabinet is the visible step: the 2150H measures 20.4 × 17.8 × 29.8 inches (D × W × H) against the 2120H's 16.3-inch depth, ships at 132 lb against 112 lb, and holds 1.0 gal against 0.75 gal. Its higher 20 MBH minimum fire means low-load homes will modulate more steadily on the 2120H.
Crown Boiler Co.
The Crown Phantom II PHTM2120H fires 13.6 to 120 MBH at 95.0% AFUE with 112 MBH DOE heating capacity and a 97 MBH net AHRI rating, keeping the same 16.3 × 17.8 × 29.8 inch cabinet as the 2080H at 112 lb shipping.
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.
The large cabinet — 20.4 × 17.8 × 29.8 inches (D × W × H), shared with the PHTM2180H — against the 2120H's 16.3-inch-deep small cabinet.
Input rises from 13.6–120 to 20–150 MBH, DOE capacity from 112 to 141 MBH, net AHRI from 97 to 123 MBH and shipping weight from 112 to 132 lb.
It depends on the load: a home whose design-day load sits far below the 2150H's range will spend more time at minimum fire, which favours the 2120H's 13.6 MBH floor.
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.