**Exhibit 12.1**

 

**Thermon Group Holdings, Inc.**

 

**Computation of Ratio of Earnings to Fixed Charges**

(amounts in thousands)

 
| ** **                                                                   | ** ** | **Predecessor** | ** ** | **Predecessor   Successor   Combined**        | ** ** |
|------------------------------------------------------------------------------|------------|-----------------|------------|-----------------------------------------------|------------|
| ** **                                                                   | ** ** | **2009**        | ** ** | **Year Ended March 31   2010** | ** ** | **2011** | ** ** |
| **Earnings**                                                                 |       |            |       |                                          |       |   |   |
|                                                                         |       |            |       |                                          |       |   |   |
| Income (loss) from continuing operations before   provision for income taxes |       | $               | 28,196     |                                          | $          | 32,906 |   | $ | (26,481 | ) |
|                                                                         |       |            |       |                                          |       |   |   |
| **Plus: Fixed Charges**                                                      |       |            |       |                                          |       |   |   |
|                                                                         |       |            |       |                                          |       |   |   |
| Interest expense and amortization of   premiums/discounts (a)                |       | 9,625           |       | 7,357                                         |       | 29,000 |   |
| Estimated interest component of rental expense                               |       | 535             |       | 566                                           |       | 677 |   |
|                                                                         |       |            |       |                                          |       |   |   |
| **Total Fixed Charges**                                                      |       | $               | 10,160     |                                          | $          | 7,923 |   | $ | 29,677 |   |
|                                                                         |       |            |       |                                          |       |   |   |
| **Less:**                                                                    |       |            |       |                                          |       |   |   |
|                                                                         |       |            |       |                                          |       |   |   |
| **Pre tax income from continuing   operations plus fixed charges**           |       | $               | 38,356     |                                          | $          | 40,829 |   | $ | 3,196 |   |
|                                                                         |       |            |       |                                          |       |   |   |
| **Ratio of Earnings to Fixed Charges**                                       |       | 3.8             |       | 5.2                                           |       | 0.11 |   |

 

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(a)          The Company considers one-third of rent expense to be a reasonable estimate of the related interest expense. 

 

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