Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The EFT-285 and EFT-399 are the two 10:1-generation Elite FT boilers: the EFT-399 adds 114 MBH of capacity (367 vs 262 MBH), grows to the 25.5 x 36.4 x 23.6 in cabinet at 298 lb, uses a 1-1/2" copper SWT connection and a 4" (200 ft) vent, and prints 97.1 thermal efficiency against the EFT-285's 95.1% AFUE.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | HTP EFT-285 | HTP EFT-399 |
|---|---|---|
| Input rate, minimum | 28.5 MBH | 39.9 MBH |
| Input rate, maximum | 285 MBH | 399 MBH |
| Heating capacity | 262 MBH | 367 MBH |
| Shipping weight | 203 lb | 298 lb |
| Boiler water content | 6.1 gal | 7.9 gal |
| Dimensions (W x H x D) | 20" x 32.6" x 20.6" | 25.5" x 36.4" x 23.6" |
| CH supply/return connection | 1-1/4" copper SWT | 1-1/2" copper SWT |
| Venting | 3" (150 ft combined) | 4" (200 ft combined) |
| Turndown | 10:1 | 10:1 |
LP-657 prints the EFT-285 at 28,500-285,000 BTU/hr and the EFT-399 at 39,900-399,000; heating capacity steps from 262 to 367 MBH and the retired page prints 95.1% AFUE (285) and 97.1 thermal efficiency (399).
The EFT-399 moves to the larger 25.5 x 36.4 x 23.6 in cabinet with 7.9 vs 6.1 gal water content and 298 vs 203 lb shipping weight.
Connections grow from 1-1/4" to 1-1/2" copper SWT (both 1" NPTF gas) and venting from 3" (150 ft) to 4" (200 ft); both are 10:1, 80 PSI MAWP models.
HTP
The HTP EFT-285 is the 285 MBH class model of the retired Elite FT stainless steel fire-tube boiler line: 28,500 to 285,000 BTU/hr input, 262 MBH heating capacity, 203 lb shipping weight and a 10:1 turndown, recorded from the official LP-387 technical table and the LP-657 10:1-generation table.
HTP
The HTP EFT-399 is the 399 MBH class model of the retired Elite FT stainless steel fire-tube boiler line: 39,900 to 399,000 BTU/hr input, 367 MBH heating capacity, 298 lb shipping weight and a 10:1 turndown, recorded from the official LP-387 technical table and the LP-657 10:1-generation table.
39,900-399,000 BTU/hr in LP-657 (10:1 generation) with 367 MBH heating capacity and 97.1 printed thermal efficiency.
Yes — 1-1/2" copper SWT supply/return and a 4" (200 ft) combined vent against the EFT-285's 1-1/4" and 3" (150 ft).
LP-657/LP-387 print 298 lb against 203 lb for the EFT-285, with 7.9 vs 6.1 gal water content.
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.