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 UFT-80W and UFT-100W are the two smallest UFT wall boilers and are physically the same unit: both weigh 90 lb in the 17.5 x 34 x 15.4 in cabinet with 8,000–10,000 BTU/hr minimum fires, identical venting and connections. The 100 adds 20 MBH of input ceiling (95 versus 76 MBH heating capacity) while its printed DOE AFUE is slightly lower at 95.1% against 95.4%.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | HTP UFT-80W | HTP UFT-100W |
|---|---|---|
| Input rate, minimum (natural gas) | 8 MBH | 10 MBH |
| Input rate, maximum (natural gas) | 80 MBH | 100 MBH |
| DOE AFUE | 95.4 % | 95.1 % |
| Heating capacity | 76 MBH | 95 MBH |
| Turndown | 10:1 | 10:1 |
| Venting | 2" to 50 ft or 3" to 100 ft, combined equivalent feet | 2" to 50 ft or 3" to 100 ft, combined equivalent feet |
| Weight, wall-mount model | 90 lb | 90 lb |
| Dimensions, wall model (W x H x D) | 17.5" x 34" x 15.4" | 17.5" x 34" x 15.4" |
Both models are wall-mounted medium-mass boilers of HTP's UFT (Universal Fire Tube) line, sharing the 90 lb wall cabinet at 17.5 x 34 x 15.4 in, the same 1-1/4" NPT CH connections, the same 2"-to-50 ft / 3"-to-100 ft venting and the same 10:1 turndown claim of the family. Each also has a floor-standing sibling (UFT-80F / UFT-100F) with identical ratings at 120 lb.
The UFT-80W fires 8,000 to 80,000 BTU/hr with a 76 MBH heating capacity at 95.4% DOE AFUE; the UFT-100W steps the ceiling to 100,000 BTU/hr and the heating capacity to 95 MBH, with the printed DOE AFUE at 95.1%. Because minimum fires are nearly equal, in mild weather both track low load the same way — the extra size only buys design-day headroom.
Venting, gas pressure (NG 3.5–14" w.c., LP 8–13" w.c.), water pressure (12–30 psi) and the out-of-the-box 10-year residential warranty are identical, so the heat-loss calculation, not the appliance, decides between them.
HTP
The HTP UFT-80W is the 80 MBH class wall-mounted model of HTP's Universal Fire Tube (UFT) medium-mass condensing boiler line: 8 to 80 MBH natural-gas input, 95.4% DOE AFUE and 76 MBH heating capacity in a 90 lb wall cabinet.
HTP
The HTP UFT-100W is the 100 MBH class wall-mounted model of HTP's Universal Fire Tube (UFT) medium-mass condensing boiler line: 10 to 100 MBH natural-gas input, 95.1% DOE AFUE and 95 MBH heating capacity in a 90 lb wall cabinet.
Effectively yes: the same 90 lb wall cabinet and dimensions, the same minimum-fire behaviour and the same connections. The difference is the firing ceiling — 80,000 against 100,000 BTU/hr.
The UFT-80W prints 95.4% DOE AFUE against 95.1% for the UFT-100W. The difference is small enough that matching the boiler to the calculated heat loss matters more.
When the heat-loss calculation plus any indirect-tank recovery load approaches the 80's 76 MBH heating capacity on a design day; otherwise the smaller unit condenses the same.
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.