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Comparison
Verdict in brief
The HTP EFW-285WBN and HTP EFW-399WBN are both condensing boilers in the HTP EFW Series line. Published ratings: HTP EFW-285WBN at 28.5–285 MBH input and 263 MBH heating capacity; HTP EFW-399WBN at 39.9–399 MBH input and 380 MBH heating capacity. HTP EFW-399WBN lists 114 MBH more input than HTP EFW-285WBN (399 MBH against 285 MBH). HTP EFW-399WBN lists 70 lb more shipping weight than HTP EFW-285WBN (250 lb against 180 lb).
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | HTP EFW-285WBN | HTP EFW-399WBN |
|---|---|---|
| Input rate, minimum | 28.5 MBH | 39.9 MBH |
| Input rate, maximum | 285 MBH | 399 MBH |
| Heating capacity | 263 MBH | 380 MBH |
| Turndown | Up to 10:1 | Up to 10:1 |
| Boiler water content | 4.9 gal | 6.4 gal |
| Approximate boiler weight with water | 180 lb | 250 lb |
| Cabinet (H x W x D) | 33-3/8" x 21-1/4" x 18-5/8" | 36-5/8" x 25-1/4" x 20" |
| Vent/air intake pipe diameter | 3" | 4" |
| Water connections | 1-1/4" NPT male | 1-1/2" NPT male |
| Power supply | 120 V / 1 Ph / 60 Hz, less than 12 A | 120 V / 1 Ph / 60 Hz, less than 12 A |
| Fuel | Natural gas (factory) or propane with documented conversion kits | Natural gas (factory) or propane with documented conversion kits |
| Net AHRI rating, water | 228 MBH | 330 MBH |
| Gas connection | 3/4" NPT male | 3/4" NPT male |
| Water pressure | Maximum operating pressure 80 psi; 30 psi ASME pressure relief valve factory supplied | Maximum operating pressure 80 psi; 30 psi ASME pressure relief valve factory supplied |
| Heat exchanger | SA240-S43932 stainless steel, down-fired fire tube, ASME 'H' stamped | SA240-S43932 stainless steel, down-fired fire tube, ASME 'H' stamped |
| Control | Advanced Honeywell Sola boiler controller with backlit screen | Advanced Honeywell Sola boiler controller with backlit screen |
| Mounting | Wall mount standard; floor mounting with optional kit (HTP P/N 6000084630) | Wall mount standard; floor mounting with optional kit (HTP P/N 6000084630) |
| Altitude operation | Maximum listed capacity at 0–2,000 ft; derate 4% per 1,000 ft above 2,000 ft | Maximum listed capacity at 0–2,000 ft; derate 4% per 1,000 ft above 2,000 ft |
| Warranty | 15-year limited warranty (5-year basic all components; registered installations extend pressure-vessel coverage through year 15) | 15-year limited warranty (5-year basic all components; registered installations extend pressure-vessel coverage through year 15) |
Published ratings: the HTP EFW-285WBN is rated 28.5–285 MBH input and 263 MBH heating capacity; the HTP EFW-399WBN is rated 39.9–399 MBH input and 380 MBH heating capacity. HTP EFW-399WBN lists 114 MBH more input than HTP EFW-285WBN (399 MBH against 285 MBH).
HTP EFW-399WBN lists 70 lb more shipping weight than HTP EFW-285WBN (250 lb against 180 lb). The boiler water content differs: the HTP EFW-285WBN lists 4.9 gal, while the HTP EFW-399WBN lists 6.4 gal. The dimensions differs: the HTP EFW-285WBN lists 33-3/8" x 21-1/4" x 18-5/8", while the HTP EFW-399WBN lists 36-5/8" x 25-1/4" x 20". The venting differs: the HTP EFW-285WBN lists 3", while the HTP EFW-399WBN lists 4".
Both records print the same turndown (Up to 10:1), electrical requirement (120 V / 1 Ph / 60 Hz, less than 12 A), fuel (Natural gas (factory) or propane with documented conversion kits) and gas connection (3/4" NPT male), per the cited sources.
The HTP EFW-285WBN is the 285 MBH class wall-mount model of the current EFW (Elite Firetube Wall Mount) line: 28.5 to 285 MBH input, 263 MBH heating capacity, a 228 MBH net AHRI water rating at 95% AFUE, a 3" vent connection and a 180 lb wall package with the Honeywell Sola control.
The HTP EFW-399WBN is the 399 MBH class wall-mount model of the current EFW (Elite Firetube Wall Mount) line: 39.9 to 399 MBH input, 380 MBH heating capacity, a 330 MBH net AHRI water rating at 95.4% thermal efficiency, a 4" vent connection and a 250 lb wall package with the Honeywell Sola control.
The HTP EFW-399WBN lists 399 MBH, against 285 MBH on the HTP EFW-285WBN, per the cited documentation.
The HTP EFW-399WBN lists 380 MBH, against 263 MBH on the HTP EFW-285WBN.
It ships at 250 lb against 180 lb for the HTP EFW-285WBN, 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.