Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The Phase III TR-20 and TR-30 are adjacent TR tanks: 20 versus 30 gallons domestic capacity, 80 versus 87 MBH boiler heating capacity and first-hour flows of 125 versus 140 gal/hr. Both use 3/4" domestic and 1" boiler connections with a 3/4 ft boiler-side head loss.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Triangle Tube Phase III TR-20 | Triangle Tube Phase III TR-30 |
|---|---|---|
| Domestic water capacity | 20 gal | 30 gal |
| Boiler water volume | 8 gal | 9 gal |
| Heating surface | 12 sq ft | 15 sq ft |
| Boiler heating capacity | 80 MBH | 87 MBH |
| First hour flow | 125 gal/hr | 140 gal/hr |
| Continuous flow | 110 gal/hr | 115 gal/hr |
| Minimum circulator flow | 5 GPM | 6 GPM |
| Domestic connection | 3/4" | 3/4" |
| Boiler connection | 1" | 1" |
| Empty weight | 110 lb | 165 lb |
The archived manual lists the TR-20 at 20 gallons domestic capacity, 8 gallons boiler water, 12 sq ft heating surface, 80 MBH boiler heating capacity, 35 gal/10 min peak flow, 125 gal/hr first-hour flow, 110 gal/hr continuous flow and a 5 gpm minimum circulator flow.
The TR-30 lists 30 gallons domestic, 9 gallons boiler water, 15 sq ft surface, 87 MBH coil, 45 gal/10 min peak, 140 gal/hr first hour, 115 gal/hr continuous and a 6 gpm minimum circulator flow.
Both print 3/4" domestic and 1" boiler connections, a 3/4 ft boiler-side head loss and vertical-only installation; the TR-30 adds 10 gallons of storage and 55 lb of empty weight.
Triangle Tube
The Triangle Tube Phase III TR-20 is a discontinued 20-gallon indirect water heater with 8 gallons of boiler water, 12 sq ft of heating surface and a printed first-hour flow of 125 gallons at 50°F inlet / 140°F outlet / 200°F boiler supply.
Triangle Tube
The Triangle Tube Phase III TR-30 is a discontinued 30-gallon indirect water heater with 9 gallons of boiler water, 15 sq ft of heating surface and a printed first-hour flow of 140 gallons at 50°F inlet / 140°F outlet / 200°F boiler supply.
The archived manual prints 20 gallons for the TR-20 and 30 gallons for the TR-30, with boiler water volumes of 8 and 9 gallons.
No — the printed minimum circulator flows are 5 gpm for the TR-20 and 6 gpm for the TR-30.
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.