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Comparison
Verdict in brief
Both the Pennco 1604HSID and the Pennco 1605HSID belong to the Pennco 16 Series line of non-condensing boilers. Published ratings: Pennco 1604HSID at 112 / 105 MBH input, 91 / 85 MBH heating capacity and 82% AFUE; Pennco 1605HSID at 150 / 140 MBH input, 122 / 114 MBH heating capacity and 82% AFUE. The published input differs: Pennco 1604HSID lists 112 / 105 MBH, while Pennco 1605HSID lists 150 / 140 MBH. Both list the same published AFUE of 82%. Pennco 1605HSID lists 72 lb more shipping weight than Pennco 1604HSID (440 lb against 368 lb).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Pennco 1604HSID | Pennco 1605HSID |
|---|---|---|
| Input (natural gas / LP) | 112 / 105 MBH | 150 / 140 MBH |
| Heating capacity (natural gas / LP) | 91 / 85 MBH | 122 / 114 MBH |
| Efficiency (AFUE) | 82 % | 82 % |
| 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 |
| Approx. shipping weight | 368 lb | 440 lb |
| Dimensions (width × height × depth) | 14-1/2" × 36-3/8" × 26-1/2" | 17-3/4" × 36-3/8" × 26-1/2" |
| Venting | Chimney vented with integral draft diverter | Chimney vented with integral draft diverter |
| Steam connections | 2" supply and 2" return | 2" supply and 2" return |
| Control | Intermittent pilot control with continuous retry and 100% shut-off | Intermittent pilot control with continuous retry and 100% shut-off |
| Fuel | Natural gas or propane (conversion kits available) | Natural gas or propane (conversion kits available) |
| Net steam (natural gas / LP) | 68 / 64 MBH | 92 / 86 MBH |
| Steam square feet (natural gas / LP) | 283 / 267 sq ft | 383 / 358 sq ft |
| Flue diameter | 6" | 6" |
Published ratings: the Pennco 1604HSID is rated 112 / 105 MBH input, 91 / 85 MBH heating capacity and 82% AFUE; the Pennco 1605HSID is rated 150 / 140 MBH input, 122 / 114 MBH heating capacity and 82% AFUE. The published input differs: Pennco 1604HSID lists 112 / 105 MBH, while Pennco 1605HSID lists 150 / 140 MBH. Both list the same published AFUE of 82%.
Pennco 1605HSID lists 72 lb more shipping weight than Pennco 1604HSID (440 lb against 368 lb). The dimensions differs: the Pennco 1604HSID lists 14-1/2" × 36-3/8" × 26-1/2", while the Pennco 1605HSID lists 17-3/4" × 36-3/8" × 26-1/2".
Both records print the same AFUE (82%), domestic-hot-water arrangement (Heating-only boiler — domestic hot water comes from a separate indirect tank or water heater), venting (Chimney vented with integral draft diverter) and water connections (2" supply and 2" return), per the cited sources.
Pennco
The Pennco 1604HSID is the second 16 Series size: 112/105 MBH input (natural gas/LP) with 91/85 MBH heating capacity and a 68/64 MBH net steam rating at 82% AFUE.
Pennco
The Pennco 1605HSID is the mid-size 16 Series model: 150/140 MBH input (natural gas/LP) with 122/114 MBH heating capacity and a 92/86 MBH net steam rating at 82% AFUE.
The Pennco 1604HSID lists 112 / 105 MBH, while the Pennco 1605HSID lists 150 / 140 MBH, per the cited documentation.
Both list the same AFUE of 82%.
It ships at 440 lb against 368 lb for the Pennco 1604HSID, per the cited sources.
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.