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Smith Cast Iron Boilers · 19HE Series

Smith 19HE-4

The Smith 19HE-4 is a 12.5 HP cast-iron sectional power-burner boiler rated 421 MBH gross output — 520 MBH gas or 3.6 GPH No. 2 oil burner capacity — with a 7" flue connection and printed thermal efficiencies of 84.1% (oil) and 81.5% (gas).

CurrentCanadian status unknown
Service this modelEstimate a replacement

Key figures

Max input
520 MBH
Max CSA output
—
AFUE
—
Min input
—
Natural gasDHW: unknowncommercial

Input is gas energy consumed; output is heat delivered. Never size from input alone.

Smith 19HE-4 in practice

The 19HE-4 is the 4-section size of Smith's 19HE Series, a wet-base cast-iron power-burner boiler for light-commercial hot water or steam heating. BSG-10 prints 421 MBH gross output, 520 MBH gas burner capacity and a 3.6 GPH No. 2 oil firing rate; the G19HE-5 brochure adds net I=B=R ratings of 316 MBH steam and 366 MBH water, 35.8 sq ft of heating surface and a 3.5 cu ft furnace volume.

The 19IOM-8R manual prints 41 GPM at a 20 °F system drop for this size, with recommended 2" supply and 2" return piping and 3" supply/return tappings on the tapping diagram. The boiler is rated 15 psi steam / 80 psi water and is fired by a choice of Beckett, Carlin or Power Flame burners (S-19PBF-4 documents the Power Flame fit). Smith's official nav lists the 19HE as a current commercial line; no Canada-specific product statement was found, so canadianStatus stays unknown.

Best suited to

  • Light-commercial hot water or steam plants whose calculated load fits 421 MBH gross output
  • Smaller buildings and additions where a 3–6 section block fits the boiler room
  • Retrofits that keep a chimney and can use oil, gas or gas/oil power-burner firing

Applicability and support

Model number
19HE-4
Canadian availability
unknown
Production status
current
ROMA supplies
Confirmed at consultation
ROMA services
Confirmed at consultation
Warranty
Not verified

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.

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Specifications

Published specifications

Values as published by Smith Cast Iron Boilers. Units are shown with every value; notes flag conflicting sources or missing figures.

Smith 19HE-4 specifications
SpecificationValueNote
Input
Gas burner capacity (as printed)520 MBHI=B=R gas burner capacity printed in BSG-10 and G19HE-5.
Oil firing rate (as printed)3.6 GPHNo. 2 fuel oil at 140,000 BTU/gal, printed in BSG-10 and G19HE-5.
Output
Gross output (as printed)421 MBHI=B=R gross output printed in BSG-10 and G19HE-5.
Net I=B=R steam rating316 MBHNet steam rating (pickup allowance 1.333) printed in G19HE-5.
Net I=B=R water rating366 MBHNet water rating (allowance 1.15) printed in G19HE-5.
Efficiency
Thermal efficiency — oil84.1 %Printed in BSG-10 and G19HE-5.
Thermal efficiency — gas81.5 %BSG-10 prints 81.5% gas thermal efficiency for this size.
Venting and air
Flue pipe diameter7"Printed in BSG-10; the 19IOM-8R prints 11- and 12-section units requiring a 12" vent with a transition collar.
Physical and connections
Boiler tappings3" supply taps / 3" return tap (tapping diagram); supplied with 4" water supply tapping and 3" return tapping19IOM-8R tapping diagram and the NOTE under Table 6.
Recommended supply / return piping2" supply / 2" return19IOM-8R Table 6 at 20 °F system temperature drop, 41 GPM.
Heating surface35.8 sq ftPrinted in G19HE-5.
Furnace volume3.5 cu ftPrinted in G19HE-5.
Water content — steam41 galPrinted in G19HE-5.
Water content — water49 galPrinted in G19HE-5.
Working weight — steam2,057 lbPrinted in G19HE-5.
Working weight — water2,122 lbPrinted in G19HE-5.
Maximum allowable working pressure15 psi steam / 80 psi waterPrinted in BSG-10.
Operating limits and other
Boiler horsepower12.5Printed in G19HE-5.
FuelNatural gas; oil and gas/oil firing availableBSG-10 prints gas burner capacities and No. 2 fuel-oil firing rates; the product page says the 19HE is a power-burner boiler 'fired with oil, gas or both'. The schema's fuel enum has no oil value, so oil capability is carried here.

Manuals

Alerts documented for this model

None documented yet.

Services

Related parts & service

Frequently asked questions

What output does the Smith 19HE-4 produce?

BSG-10 prints 421 MBH gross output for the 19HE-4, with 316 MBH net steam and 366 MBH net water I=B=R ratings in the G19HE-5 brochure. Size from a heat-loss calculation, not from the model number.

Is the 19HE-4 gas or oil?

Both are documented: 520 MBH gas burner capacity and a 3.6 GPH No. 2 oil firing rate are printed for this size, and the product page calls the 19HE a boiler 'fired with oil, gas or both'.

What connections does the 19HE-4 use?

The tapping diagram shows 3" supply taps and a 3" return tap, and Table 6 of 19IOM-8R recommends 2" supply and 2" return piping for 41 GPM at 20 °F ΔT. The manual note also states the boiler is supplied with a 4" water supply tapping and 3" return tapping.

Questions about the Smith 19HE-4?

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.

Call 778-909-5731Request service

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Sources and verification

Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.

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