Fulton · Series
Fulton ENDURA XE
The ENDURA XE is Fulton's condensing firetube hydronic boiler in twelve sizes from EXE-399 to EXE-6000 (399,000–6,000,000 BTU/hr) with Flame-by-Wire combustion, real-time O2 compensation, efficiency up to 99% and 8:1–15:1 turndown.
Series facts
- Type
- condensing
- Efficiency
- 99% thermal-efficiency
- Fuel
- Condensing firetube hydronic line in the ENDURA family; fuel rows are printed in Fulton's per-model documents.
- Venting
- Unknown
- Models documented
- 0
- Warranty
- Not verified
'Efficiency up to 99%' headline on the product page; the page's spec table prints per-model AHRI Thermal Efficiency of 96.0–98.0% across the twelve EXE sizes.
About the ENDURA XE
Fulton's ENDURA XE is the 12-size condensing firetube hydronic line: EXE-399, 500, 650, 750, 1000, 1500, 2000, 2500, 3000, 4000, 5000 and 6000 (399,000–6,000,000 BTU/hr). The page prints 'Efficiency up to 99%', Flame-by-Wire combustion, Real-Time O2 Compensation and variable primary flow, with firetube water volume said to eliminate buffer tanks.
The spec-table excerpt on the page prints AHRI Thermal Efficiency (%) of 98.0 / 97.3 / 96.3 / 96.0 / 97.8 / 97.6 / 97.5 / 97.3 / 97.2 / 96.8 / 96.5 / 96.2 across the twelve models respectively, with turndown of 8:1–15:1. Fulton also markets '-15% fossil fuel use, -80% NOx vs conventional boilers' for the line.
The page's lead-time rows printed most models as 'In Stock' at research time. The current ENDURA XE brochure is public and linked from this hub.
Highlights
- Condensing firetube hydronic boiler in 12 sizes (399,000 – 6,000,000 BTU/hr)
- Models EXE-399 … EXE-6000
- Efficiency up to 99%; AHRI thermal efficiency 96.0–98.0% across the 12 sizes (spec table)
- 8:1–15:1 turndown; Flame-by-Wire; real-time O2 compensation
- Firetube water volume said to eliminate buffer tanks
Models
ENDURA XE models
One canonical page per model with input, output and efficiency kept separate.
Error codes and alerts
ENDURA XE alerts
No alerts documented for this series yet.
Manuals
Official documents
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.
Services for Fulton boilers
Frequently asked questions
What is the ENDURA XE efficiency?
The page headlines efficiency up to 99%, and its spec table prints AHRI Thermal Efficiency of 98.0 down to 96.2% across the twelve EXE sizes (98.0 for the EXE-399, 96.2 for the EXE-6000).
What sizes does the ENDURA XE come in?
Twelve sizes from EXE-399 to EXE-6000, i.e. 399,000 to 6,000,000 BTU/hr.
Talk to a boiler technician
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
- Fulton — ENDURA XE product page · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.