Johnston Boiler Company · Series
Johnston Boiler Company 509 Series
The Johnston 509 Series is the company's flagship packaged firetube boiler, built in 3-pass PFTA/PFTS and 4-pass PFTEC/PFTJ/PFTX versions — 'the Johnston 3-pass boiler is still a strong and dominate force in the boiler industry with its high steam and water storage areas, high efficiencies, rugged construction'.
Series facts
- Type
- non-condensing
- Efficiency
- Unknown
- Fuel
- Johnston packages the 509 Series with gas, oil and combination burners, including the Eagle Claw 9 PPM ultra-low-NOx burner.
- Venting
- Unknown
- Models documented
- 0
- Warranty
- Not verified
About the 509 Series
Johnston's 509 Series product pages present the 3-pass PFTA (steam and water) and 4-pass PFTEC (hot water and steam) packaged boilers. The PFTA 3-Pass page states: 'Today, the Johnston 3-pass boiler is still a strong and dominate force in the boiler industry with its high steam and water storage areas, high efficiencies, rugged construction, and its ability to keep up with wide load demands.'
The Products overview describes the shared design: 'water-back, firetube, 3- or 4-pass, steam or hot water boilers', with the 4-pass design first built in 1978 to combine water-back reliability with 4-pass efficiency, five square feet of heating surface per BHP, and a 15-year limited pressure vessel and flue door warranty. Efficiencies can reach up to 90% depending on design and operating conditions.
Johnston's 509 Series packaged units are also offered with the company's Eagle Claw 9 PPM ultra-low-NOx burner, per the product listing. Individual size downloads are published for 100 HP through 1,500 HP. No official Canadian-sales statement was found.
Highlights
- Packaged water-back firetube boiler in 3-pass (PFTA/PFTS) and 4-pass (PFTEC/PFTJ/PFTX) versions
- 5 sq ft heating surface per BHP on the 4-pass design
- 15-year limited pressure vessel and flue door warranty
- Up to 90% efficiency depending on design and operating conditions (Products page)
- Eagle Claw 9 PPM ultra-low-NOx burner packaging documented
- Size downloads published for 100 HP – 1,500 HP
Models
509 Series models
One canonical page per model with input, output and efficiency kept separate.
Error codes and alerts
509 Series 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 Johnston Boiler Company boilers
Frequently asked questions
What is the Johnston 509 Series?
The 509 Series is Johnston's packaged firetube boiler family, offered in 3-pass PFTA/PFTS and 4-pass PFTEC/PFTJ/PFTX configurations for steam or hot water.
What efficiency can a Johnston 509 reach?
Johnston's Products page states efficiencies can reach up to 90% depending on the design and operating conditions.
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
- Johnston — PFTA 3-Pass (Steam) product page · accessed September 9, 2026
- Johnston — Products overview (design description) · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.