Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
Boilers.ca is a brand of ROMA Heating & Cooling · Licensed gas contractor LGA0202903
Comparison
Verdict in brief
Both the Weil-McLain SVF 500 and the Weil-McLain SVF 600 belong to the Weil-McLain SVF (Stainless Vertical Firetube) line of condensing boilers. The Weil-McLain SVF 500 is documented at 500 MBH input, 490 MBH gross output and 98% thermal efficiency, while the Weil-McLain SVF 600 is documented at 600 MBH input, 588 MBH gross output and 98% thermal efficiency. Weil-McLain SVF 600 lists 100 MBH more input than Weil-McLain SVF 500 (600 MBH against 500 MBH). Both list the same published thermal efficiency of 98%. Both list the same published shipping weight of 572 lb.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Weil-McLain SVF 500 | Weil-McLain SVF 600 |
|---|---|---|
| Maximum input | 500 MBH | 600 MBH |
| Gross output | 490 MBH | 588 MBH |
| Thermal efficiency | 98 % | 98 % |
| Turn-down ratio | 10:1 | 12:1 |
| Domestic hot water | Heating-only commercial boiler — domestic hot water comes from a separate indirect tank or water heater | Heating-only commercial boiler — domestic hot water comes from a separate indirect tank or water heater |
| Approximate shipping weight | 572 lb | 572 lb |
| Length x width x height | 42 3/16" x 24 7/8" x 49 13/16" | 42 3/16" x 24 7/8" x 49 13/16" |
| Air intake / exhaust vent diameter | 4" | 4" |
| Supply / return water connections | 2" NPT | 2" NPT |
| Gas connection size | 1-1/4" NPT | 1-1/4" NPT |
| Fuel | Natural gas | Natural gas |
| Maximum working pressure | 160 psi | 160 psi |
| Control | Unity 2.0 color touchscreen Nuro controls | Unity 2.0 color touchscreen Nuro controls |
Published ratings: the Weil-McLain SVF 500 is rated 500 MBH input, 490 MBH gross output and 98% thermal efficiency; the Weil-McLain SVF 600 is rated 600 MBH input, 588 MBH gross output and 98% thermal efficiency. Weil-McLain SVF 600 lists 100 MBH more input than Weil-McLain SVF 500 (600 MBH against 500 MBH). Both list the same published thermal efficiency of 98%.
The turndown differs: the Weil-McLain SVF 500 lists 10:1, while the Weil-McLain SVF 600 lists 12:1.
Both records print the same thermal efficiency (98%), domestic-hot-water arrangement (Heating-only commercial boiler — domestic hot water comes from a separate indirect tank or water heater), shipping weight (572 lb) and dimensions (42 3/16" x 24 7/8" x 49 13/16"), per the cited sources.
Weil-McLain
The Weil-McLain SVF 500 is a current commercial stainless-steel vertical fire-tube condensing boiler: 500 MBH maximum input, 490 MBH gross output at 98% thermal efficiency, with a 10:1 turn-down, 2" NPT supply/return, 1-1/4" NPT gas and a 4" vent connection.
Weil-McLain
The Weil-McLain SVF 600 is a current commercial stainless-steel vertical fire-tube condensing boiler: 600 MBH maximum input, 588 MBH gross output at 98% thermal efficiency, with a 12:1 turn-down, 2" NPT supply/return, 1-1/4" NPT gas and a 4" vent connection.
The Weil-McLain SVF 600 lists 600 MBH, against 500 MBH on the Weil-McLain SVF 500, per the cited documentation.
Both list the same thermal efficiency of 98%.
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 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.