Triangle Tube · Phase III (TR / SMART)
Triangle Tube Phase III SMART 20
The Triangle Tube Phase III SMART 20 is a discontinued 22-gallon indirect water heater with 5 gallons of boiler water, 11 sq ft of heating surface and a printed first-hour flow of 110 gallons at 50°F inlet / 140°F outlet / 200°F boiler supply.
Key figures
- Max input
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- Max CSA output
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- AFUE
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- Min input
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Input is gas energy consumed; output is heat delivered. Never size from input alone.
Triangle Tube Phase III SMART 20 in practice
The Phase III SMART 20 is a 22-gallon indirect water heater in the SMART family of Triangle Tube's discontinued Phase III line, documented in the archived official installation and operation manual. The printed specifications table lists 5 gallons of boiler water, 11 sq ft of heating surface, 3/4 ft of boiler-side head loss, 3/4" domestic and 1" boiler connections, a 25.5" drywell and a 100 lb empty weight.
The performance table prints a 70 MBH boiler heating capacity, 35 gal/10 min peak flow, 110 gal/hr first-hour flow, 95 gal/hr continuous flow and a 5 gpm minimum circulator flow at 50°F domestic cold water inlet, 140°F domestic hot water outlet and 200°F boiler water supply. The Phase III stores domestic water in a stainless steel tank and reheats it through the coil; vertical installation only, with maximum 190°F domestic and 210°F boiler water temperatures.
Best suited to
- Owners of an installed Phase III SMART 20 identifying its capacity and performance
- Repair-or-replace decisions comparing a Phase III with the current Cardinal / Smart 316 line
- Contractors matching a Phase III tank to its archived manual before service
Applicability and support
- Model number
- SMART 20
- Canadian availability
- historical
- Production status
- discontinued
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Series terms
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.
Specifications
Published specifications
Values as published by Triangle Tube. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Domestic hot water | ||
| Domestic water capacity | 22 gal | Per the archived manual's dimensions and specifications table. |
| Peak flow | 35 gal/10 min | Per the archived manual's performance table. |
| First hour flow | 110 gal/hr | Per the archived manual's performance table at 50°F inlet / 140°F outlet / 200°F boiler supply. |
| Continuous flow | 95 gal/hr | Per the archived manual's performance table. |
| Physical and connections | ||
| Boiler water volume | 5 gal | Per the archived manual's specifications table. |
| Heating surface | 11 sq ft | Per the archived manual's specifications table. |
| Head loss, boiler side | 3/4 ft | Per the archived manual's specifications table. |
| Domestic connection | 3/4" | Per the archived manual's specifications table. |
| Boiler connection | 1" | Per the archived manual's specifications table. |
| Drywell length | 25.5 in | Per the archived manual's specifications table. |
| Empty weight | 100 lb | Per the archived manual's specifications table. |
| Operating limits and other | ||
| Boiler heating capacity | 70 MBH | Per the archived manual's performance table. |
| Minimum circulator flow | 5 GPM | Per the archived manual's performance table. |
Alerts documented for this model
None documented yet.
Frequently asked questions
What are the Phase III SMART 20 ratings?
The archived manual prints 22 gallons of domestic capacity, 70 MBH boiler heating capacity, 110 gal/hr first-hour flow and a 5 gpm minimum circulator flow.
Is the Phase III still sold?
No. It is a discontinued line documented in an archived official manual; Triangle Tube's current indirect water heaters are the Cardinal and Smart 316 families.
What conditions are the Phase III ratings based on?
The performance tables are printed at 50°F domestic cold water inlet, 140°F domestic hot water outlet and 200°F boiler water supply, with additional tables for other supply temperatures.
Questions about the Triangle Tube Phase III SMART 20?
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.
Compare and explore
- Triangle Tube Phase III SMART 100 vs SMART 20Comparison
- Triangle Tube Phase III SMART 20 vs SMART 30Comparison
- Triangle Tube Phase III TR-20Same series
- Triangle Tube Phase III TR-30Same series
- Triangle Tube Phase III TR-36Same series
- Triangle Tube Phase III TR-45Same series
- Triangle Tube Phase III TR-60Same series
- Triangle Tube Phase III TR-80Same series
- Triangle Tube Phase III TR-100Same series
- Triangle Tube Phase III TR-120Same series
- Triangle Tube Phase III SMART 30Same series
- Triangle Tube Phase III SMART 40Same series
- Triangle Tube Phase III SMART 50Same series
- Triangle Tube Phase III SMART 60Same series
- Triangle Tube Phase III SMART 80Same series
- Triangle Tube Phase III SMART 100Same series
- Phase III (TR / SMART) series hub
- Buying guide
Sources and verification
- Triangle Tube — Phase III TR Series and SMART Series Water Heater Installation and Operation Manual (Wayback capture of triangletube.com, 2015) · accessed September 9, 2026
- Triangle Tube — official site · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.