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
The Squire SIT030 and SIT050 are indirect tanks at 27 and 52 gallons: first-hour delivery rises from 184 to 255 gallons, the minimum coil load from 99,000 to 133,000 BTU/hr and the shipping weight from 79 to 131 lb. Both use 1" domestic connections and 1" boiler connections.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Lochinvar Squire SIT030 | Lochinvar Squire SIT050 |
|---|---|---|
| Domestic water capacity | 27 gal | 52 gal |
| Heat source water volume | 1.1 gal | 1.7 gal |
| Standby loss | 1.5 °F/hr | 0.9 °F/hr |
| First draw | 24 gal | 45 gal |
| Continuous delivery | 160 GPH | 210 GPH |
| First hour delivery | 184 gal | 255 gal |
| Minimum coil load | 99,000 BTU/hr | 133,000 BTU/hr |
| Flow rate | 14 GPM | 14 GPM |
| Domestic water connections | 1" | 1" |
| Shipping weight | 79 lb | 131 lb |
The SIT-Sub-03 table lists the SIT030 at 27 gallons capacity, 1.1 gallons heat-source volume, 1.5°F/hr standby loss, 24 gallons first draw, 160 gph continuous delivery, 184 gallons first-hour delivery and a 99,000 BTU/hr minimum coil load.
The SIT050 lists 52 gallons capacity, 1.7 gallons heat-source volume, 0.9°F/hr standby loss, 45 gallons first draw, 210 gph continuous delivery, 255 gallons first-hour delivery and a 133,000 BTU/hr minimum coil load.
Both use 1" domestic and 1" boiler connections with a 14.0 gpm flow rate; the friction loss rises from 3.9 ft (SIT030) to 5.3 ft (SIT050).
Lochinvar
The Lochinvar Squire SIT030 is a 27-gallon single-wall indirect water heater with a 316L stainless steel tank and coil, 1.5°F/hr standby loss and a 79 lb shipping weight.
Lochinvar
The Lochinvar Squire SIT050 is a 52-gallon single-wall indirect water heater with a 316L stainless steel tank and coil, 0.9°F/hr standby loss and a 131 lb shipping weight.
The SIT050 holds 52 gallons versus 27 gallons on the SIT030, per the SIT-Sub-03 submittal.
No — the printed minimum coil loads are 99,000 BTU/hr for the SIT030 and 133,000 BTU/hr for the SIT050.
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.