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 PHTM2080H and PHTM2120H are the two smallest Phantom II heat-only boilers: identical 95.0% AFUE, 10:1 modulation, 16.3 × 17.8 × 29.8 inch cabinet, 2"/3" venting to 70/135 ft, 1" sweat water and 1/2" MPT gas connections at 50 psig MAWP. The 2120H fires 13.6–120 MBH against the 2080H's 8–80 MBH, lifting DOE capacity from 75 to 112 MBH and net AHRI from 65 to 97 MBH.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Crown Phantom II PHTM2080H | Crown Phantom II PHTM2120H |
|---|---|---|
| Input, minimum | 8 MBH | 13.6 MBH |
| Input, maximum | 80 MBH | 120 MBH |
| DOE heating capacity | 75 MBH | 112 MBH |
| Net AHRI water rating | 65 MBH | 97 MBH |
| Efficiency (AFUE) | 95 % | 95 % |
| Turndown ratio | 10:1 | 10:1 |
| Boiler water content | 0.5 gal | 0.75 gal |
| Shipping weight | 107 lb | 112 lb |
| Dimensions (D × W × H) | 16.3" × 17.8" × 29.8" | 16.3" × 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 are stainless steel, modulating, direct-vent condensing boilers on the gas-adaptive 'PHTM II' control, rated 95.0% AFUE with direct spark ignition and the same 16.3 × 17.8 × 29.8 inch cabinet, 2" venting to 70 ft (3" with increaser to 135 ft), 1" sweat supply/return, 1/2" MPT gas and 50 psig MAWP.
The 2120H raises the input ceiling from 80 to 120 MBH (minimum 8 to 13.6 MBH at sea level), and the ratings table prints 112 MBH DOE heating capacity and a 97 MBH net AHRI water rating against the 2080H's 75 and 65 MBH. Above 2,000 ft the 2080H's minimum input rises to 10 MBH.
The physical differences are small: the 2120H ships at 112 lb against the 2080H's 107 lb and holds 0.75 gal of water against 0.5 gal. Neither makes domestic hot water, so the choice follows the heat-loss calculation — homes whose design-day load clears the 2080H's 75 MBH DOE ceiling are the 2120H's audience.
Crown Boiler Co.
The Crown Phantom II PHTM2080H is the smallest Phantom II heat-only boiler: 8 to 80 MBH input at 95.0% AFUE with 10:1 modulation, 75 MBH DOE heating capacity and a 65 MBH net AHRI rating, in the shared 16.3 × 17.8 × 29.8 inch cabinet.
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.
Input rises from 8–80 to 13.6–120 MBH, DOE heating capacity from 75 to 112 MBH, net AHRI from 65 to 97 MBH, water content from 0.5 to 0.75 gal and shipping weight from 107 to 112 lb.
Yes — 95.0% AFUE for every Phantom II model, heat-only and combi, per the product ratings tables.
The PHTM2080H at 8 MBH minimum input (sea level); its minimum rises to 10 MBH above 2,000 ft per the manual note.
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.