HTP EFW-340WBN
The HTP EFW-340WBN is the 340 MBH class wall-mount model of the current EFW (Elite Firetube Wall Mount) line: 39.9 to 340 MBH input, 324 MBH heating capacity, a 282 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.
Key figures
- Max input
- 340 MBH
- Max CSA output
- —
- AFUE
- —
- Min input
- 39.9 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
HTP EFW-340WBN in practice
The EFW-340WBN is a wall-mount, condensing, stainless-steel fire-tube boiler in HTP's current EFW Series. The official rating table prints 39.9–340 MBH input, 324 MBH heating capacity, a 282 MBH net AHRI water rating and 95.4% thermal efficiency on the ASME 'H' SA240-S43932 down-fired fire-tube heat exchanger; the 4" vent/air connection runs to the page's 4" up to 100 ft limit in PVC, CPVC, polypropylene or stainless steel.
The unit carries a 10:1 modulating burner with direct-spark ignition, a built-in ECM circulation arrangement on the primary loop, an integrated low-water cut-off with test switch, and the advanced Honeywell Sola boiler controller with a backlit screen, 2 central-heat inputs (high and low temperature), DHW priority, outdoor reset with the supplied 10k outdoor sensor, warm-weather shutdown, Modbus RTU and lead-lag cascade of up to eight EFW boilers. It mounts on the wall as standard (floor kit optional, HTP P/N 6000084630), weighs 250 lb with water and holds 7.1 gal; power is 120 V / 1 Ph / 60 Hz at less than 12 A.
The EFW ships factory-set for natural gas and converts to propane with the documented conversion kits; capacity is derated 4% per 1,000 ft above 2,000 ft. HTP backs the line with the 15-year limited warranty document shared with the ELU/EFTU (registered installations extend pressure-vessel coverage through year 15), and the product page advertises a free 5-year parts warranty when registered upon installation. Boilers.ca found no official statement of Canadian sales, so canadianStatus stays 'unknown'; gas, combustion and venting work belongs with a licensed contractor against the EFW I&O manual (420011327000).
Best suited to
- Homes or light-commercial loads whose heat-loss calculation fits inside 340 MBH of input
- Wall-mounted installations with long vent runs (the page allows up to 150 ft on the 285)
- Owners wanting the Honeywell Sola control with Modbus RTU and 8-boiler cascade capability
Applicability and support
- Model number
- EFW-340WBN
- Canadian availability
- unknown
- Production status
- current
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Series terms
Where ROMA provides on-site service
On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.
Specifications
Published specifications
Values as published by HTP. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Input rate, minimum | 39.9 MBH | 39,900 Btu/hr, as printed on the official EFW rating table and in I&O Table 2-1. |
| Input rate, maximum | 340 MBH | 340,000 Btu/hr, as printed on the official EFW rating table and in I&O Table 2-1. |
| Output | ||
| Heating capacity | 324 MBH | Heating capacity as printed on the official EFW rating table (ratings certified by AHRI to U.S. DOE test procedures). |
| Net AHRI rating, water | 282 MBH | Net AHRI water rating as printed on the official EFW rating table. |
| Efficiency | ||
| Thermal efficiency | 95.4 % | Thermal efficiency as printed for this size on the official EFW rating table (no AFUE row is printed for the 340/399 sizes). |
| Venting and air | ||
| Vent/air intake pipe diameter | 4" | The official page states vent runs of up to 4" up to 100 ft; approved materials are PVC, CPVC, polypropylene or stainless steel, with five vent termination options and 2" optional venting on some models. |
| Physical and connections | ||
| Water connections | 1-1/2" NPT male | As printed on the official EFW rating table. |
| Gas connection | 3/4" NPT male | As printed on the official EFW rating table. |
| Cabinet (H x W x D) | 36-5/8" x 25-1/4" x 20" | As printed on the official page rating table and in I&O Table 2-1. |
| Approximate boiler weight with water | 250 lb | As printed on the official EFW rating table. |
| Boiler water content | 7.1 gal | As printed on the official EFW rating table. |
| Water pressure | Maximum operating pressure 80 psi; 30 psi ASME pressure relief valve factory supplied | The EFW submittals print a maximum operating pressure of 80 psi and a factory-supplied 30 psi ASME relief valve; the boiler is ASME 'H' stamped to Section IV. |
| Heat exchanger | SA240-S43932 stainless steel, down-fired fire tube, ASME 'H' stamped | The page describes an ASME certified down-fired fire-tube exchanger with dimpled tubes; the submittal prints SA240-S43932 stainless steel. |
| Mounting | Wall mount standard; floor mounting with optional kit (HTP P/N 6000084630) | The submittal prints wall (standard) or floor mounting with the optional kit; zero clearance to combustibles with service clearances. |
| Electrical | ||
| Power supply | 120 V / 1 Ph / 60 Hz, less than 12 A | |
| Operating limits and other | ||
| Fuel | Natural gas (factory) or propane with documented conversion kits | The EFW I&O states the boilers are factory set for natural gas and must be converted with the listed Natural Gas to LP Conversion Kit; the conversion-kit table prints kit part numbers 560000283500 (285) and 560000283000 (340/399). |
| Turndown | Up to 10:1 | The official page and the submittal sheets print a fully modulating burner with 10:1 turndown. |
| Control | Advanced Honeywell Sola boiler controller with backlit screen | The I&O lists the Honeywell Sola Controller R7910B1015/B; features include auto-diagnostics, 2 central-heat inputs (high and low temperature), DHW priority, outdoor reset with the factory 10k outdoor sensor, warm-weather shutdown, Modbus RTU and lead-lag cascade up to 8 EFW boilers. |
| Altitude operation | Maximum listed capacity at 0–2,000 ft; derate 4% per 1,000 ft above 2,000 ft | As printed on the official page table footnotes and the I&O high-altitude table (USA de-rate: 10% at 3,000 ft, 16% at 4,000 ft, 18% at 4,500 ft, 20% at 5,000 ft per the page). |
| Warranty | 15-year limited warranty (5-year basic all components; registered installations extend pressure-vessel coverage through year 15) | The ELU/EFTU/EFW limited warranty (420030066700, 07-07-23) prints basic coverage years 1–5 at 100% and registered extended coverage years 6–10 at 100% and years 11–15 at 20% on the pressure vessel; the product page states a free 5-year parts warranty when registered upon installation. |
Manuals
Alerts documented for this model
None documented yet.
Frequently asked questions
What are the EFW-340WBN ratings?
39.9–340 MBH input, 324 MBH heating capacity, a 282 MBH net AHRI water rating and 95.4% thermal efficiency per the official EFW rating table.
What size vent does the EFW-340WBN use?
The 4" vent/air connection, with the official page stating runs up to 4" up to 100 ft in PVC, CPVC, polypropylene or stainless steel.
How is the EFW-340WBN controlled?
By the advanced Honeywell Sola boiler controller with backlit display, outdoor reset (10k sensor supplied), DHW priority, Modbus RTU and cascade of up to eight EFW boilers.
Questions about the HTP EFW-340WBN?
Describe what the boiler is doing and get a straight answer about the next step.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
- HTP — EFW Series Boiler (official model table) · accessed September 9, 2026
- EFW Installation and Operation Manual, doc 420011327000 (Version Date 2024-01-05) · accessed September 9, 2026
- EFW-340WBN Submittal Sheet (PDF) · accessed September 9, 2026
- HTP ELU, EFTU and EFW Boiler Limited Warranty (07-07-23) · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.