Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
De Dietrich MCA Pro 90 and De Dietrich MCA Pro 115 are two condensing boilers from the De Dietrich MCA Pro Series line. Published ratings: De Dietrich MCA Pro 90 at 55–326 MBH input, 306 MBH output and 94% efficiency; De Dietrich MCA Pro 115 at 82–399 MBH input, 368 MBH output and 94% efficiency. De Dietrich MCA Pro 115 lists 73 MBH more input than De Dietrich MCA Pro 90 (399 MBH against 326 MBH). Both list the same published efficiency of 94%. The published shipping weight differs: De Dietrich MCA Pro 90 lists 148 lb dry / 165 lb wetted, while De Dietrich MCA Pro 115 lists 150 lb dry / 167 lb wetted.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | De Dietrich MCA Pro 90 | De Dietrich MCA Pro 115 |
|---|---|---|
| Minimum input (as printed) | 55 MBH | 82 MBH |
| Maximum input (as printed) | 326 MBH | 399 MBH |
| Minimum heat output | 54 MBH | 79 MBH |
| Maximum heat output | 306 MBH | 368 MBH |
| Firing | Modulating, on/off, remote 0–10 V | Modulating, on/off, remote 0–10 V |
| Weight (dry / wetted) | 148 lb dry / 165 lb wetted | 150 lb dry / 167 lb wetted |
| Heating supply / return | 1-1/4" male NPT | 1-1/4" male NPT |
| Gas connection | 3/4" male NPT | 3/4" male NPT |
| Fuel | Natural gas or propane (LPG) | Natural gas or propane (LPG) |
| Thermal efficiency (CSA certified) | 94 % | 94 % |
| Vent / combustion air | 4" single pipe / 100–150 mm concentric | 4" single pipe / 100–150 mm concentric |
| Operating water temperature range | 68–190 °F (CPVC / PP / SS) | 68–190 °F (CPVC / PP / SS) |
| CSA certified installation altitude | Max 4,500 ft / 1,370 m (Canada) | Max 4,500 ft / 1,370 m (Canada) |
Published ratings: the De Dietrich MCA Pro 90 is rated 55–326 MBH input, 306 MBH output and 94% efficiency; the De Dietrich MCA Pro 115 is rated 82–399 MBH input, 368 MBH output and 94% efficiency. De Dietrich MCA Pro 115 lists 73 MBH more input than De Dietrich MCA Pro 90 (399 MBH against 326 MBH). Both list the same published efficiency of 94%.
Both records print the same turndown (Modulating, on/off, remote 0–10 V), water connections (1-1/4" male NPT), gas connection (3/4" male NPT) and fuel (Natural gas or propane (LPG)), per the cited sources.
De Dietrich
The De Dietrich MCA Pro 90 is a condensing wall-hung boiler rated 55–326 MBH input and 54–306 MBH output at 94.0% CSA thermal efficiency, with 1-1/4" heating connections and a 148 lb dry weight.
De Dietrich
The De Dietrich MCA Pro 115 is a condensing wall-hung boiler rated 82–399 MBH input and 79–368 MBH output at 94.0% CSA thermal efficiency, with 1-1/4" heating connections and a 150 lb dry weight.
The De Dietrich MCA Pro 115 lists 399 MBH, against 326 MBH on the De Dietrich MCA Pro 90, per the cited documentation.
Both list the same efficiency of 94%.
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.