Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The EFTU-110WCN and EFTU-150WCN are the two smaller Elite Fire Tube Ultra combis: both run central heating and DHW off the same printed input range (11,000–110,000 and 15,000–150,000 BTU/hr) at 95% DOE AFUE. The 150 roughly doubles the combi's hot-water delivery — 7.9 GPM against 5.8 GPM at a 35 °F rise, 6.1 against 4.5 at 45 °F, 3.6 against 2.6 at 77 °F — at the cost of an 11 lb heavier shipping package.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | HTP EFTU-110WCN | HTP EFTU-150WCN |
|---|---|---|
| Central-heating input, minimum (natural gas) | 11 MBH | 15 MBH |
| Central-heating input, maximum (natural gas) | 110 MBH | 150 MBH |
| DHW input, minimum | 11 MBH | 15 MBH |
| DHW input, maximum | 110 MBH | 150 MBH |
| DOE AFUE | 95 % | 95 % |
| Heating capacity (DOE) | 101 MBH | 138 MBH |
| DHW flow rate at 35 °F rise | 5.8 gpm | 7.9 gpm |
| DHW flow rate at 45 °F rise | 4.5 gpm | 6.1 gpm |
| DHW flow rate at 77 °F rise | 2.6 gpm | 3.6 gpm |
| Shipping weight | 110 lb | 121 lb |
| Approximate full boiler weight | 107 lb | 128.5 lb |
| Venting | Exhaust 2" (6–100 ft) or 3" (6–150 ft); intake 2" (0–100 ft) or 3" (0–150 ft) | Exhaust 2" (6–100 ft) or 3" (6–150 ft); intake 2" (0–100 ft) or 3" (0–150 ft) |
Both combis carry the line's wall cabinet (19.75 x 38.25 x 17 in) with the vertical fire-tube heat exchanger, 10:1 turndown, ECM pump and DHW priority. The EFTU-110WCN ships at 110 lb (107 lb full, 1.5 gal water content); the EFTU-150WCN ships at 121 lb (128.5 lb full, 2.1 gal water content).
The official table prints DHW flow of 5.8 / 4.5 / 2.6 GPM on the 110 combi and 7.9 / 6.1 / 3.6 GPM on the 150 at 35 / 45 / 77 °F rises, with DHW input equal to the CH input range on each. DOE heating capacity rises from 101 to 138 MBH and the net AHRI water rating from 88 to 120 MBH.
Both vent in 2" or 3" pipe (exhaust 6–100 ft in 2" or 6–150 ft in 3"; intake 0–100 ft or 0–150 ft) — the 3"-only rule starts at the 199 sizes. Neither model's 15,000 BTU/hr-class minimum fire (11,000 on the 110) is a practical low-fire differentiator, so the choice turns on the heat-loss calculation and the household's simultaneous hot-water draws.
The HTP EFTU-110WCN is the 110 MBH class wall-hung combi of the Elite Fire Tube Ultra line: 11.0 to 110 MBH input for central heating and the same range for domestic hot water, 95% DOE AFUE, 101 MBH DOE heating capacity and up to 2.6 GPM of DHW at a 77 °F rise.
The HTP EFTU-150WCN is the 150 MBH class wall-hung combi of the Elite Fire Tube Ultra line: 15.0 to 150 MBH input for central heating and the same range for domestic hot water, 95% DOE AFUE, 138 MBH DOE heating capacity and up to 3.6 GPM of DHW at a 77 °F rise.
Per the official table: 7.9 GPM versus 5.8 GPM at a 35 °F rise, 6.1 versus 4.5 GPM at 45 °F, and 3.6 versus 2.6 GPM at a 77 °F rise.
Yes — both print 95% DOE AFUE. Only the smallest boiler-only model (EFTU-85WBN) prints 96%.
The 150, when the heat-loss calculation and draw pattern exceed the 110's 101 MBH DOE heating capacity and 5.8 GPM at a 35 °F rise — but only with a matching gas supply and vent route.
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.