Thanks, Paul. I will start with details on our fourth quarter performance and then follow with our full year results. Total sales in the fourth quarter of $476 million increased 29% from the previous year. Lochinvar added $55 million to sales in the quarter, and our A. O. Smith branded products in China grew over 30%. Higher sales of commercial water heaters in advance of a regulatory change in Southern California, as well as higher residential volumes as customers recalibrated their inventory level following a drawdown in the previous quarter, added to our sales in the U.S. Earnings of $31.5 million or $0.68 increased over 50% from last year, with Lochinvar contributing to $0.11 per share in the fourth quarter.
Fourth quarter operating profit increased 30% to $58.4 million from $44.8 million in the fourth quarter of 2010, largely due to Lochinvar's operating profit of $10.2 million. Contributions from higher sales in China and in the U.S. were partially offset by higher steel costs and lower volumes in Canada. As a result, adjusted operating margins edged upward in the quarter to 12.3%. Our corporate and other expenses were $8.5 million, a decline of 35% from 1 year ago. Interest income on our offshore cash, dividends from our RBC shares and lower pension costs contributed to the improvement from last year.
Total operating profit excluding the flood impact in 2010 improved 57% to $50 million.
Total sales in 2011 of $1.7 billion were 15% higher than the previous year. Lochinvar, which we acquired in late August, added $76 million and sales of A. O. Smith branded products in China grew almost 30%. Sales of water heaters in India doubled to $19 million, and we experienced a full year of sales of gas tankless products in North America. Our commercial water heater volumes in the U.S. were higher in advance of an anticipated regulatory change in Southern California and a global, commodity-related price increase effective last April also contributed to higher sales in 2011.
Earnings of $111.2 million, or $2.39 per share, included a few non-comparable items, which collectively added $0.28 per share for the year. I will elaborate on these items more specifically on the next slide. Adjusting for the non-comparable items, our earnings of $2.11 per share improved 23% over last year's performance, excluding the impact from the flood. Operating profit increased 15% to $193.5 million from $168.3 million last year, excluding the impact from the net settlement gain in 2011 and the flood in 2010. Lochinvar's operating profit was $13.2 million, including purchase accounting charges. Organic growth in our China and U.S. commercial businesses was partially offset by a decline in volumes in Canada and losses at our water treatment business. As a result, adjusted operating margins at 11.3% were the same as last year.
Our corporate and other expenses were $45.5 million excluding the net gain and value of our hedged RBC shares and improved 12% from last year's primarily due to interest income on our cash, lower expense from incentive compensation programs and lower pension cost. Total operating profit excluding non-comparable items improved 27% to $148 million.
Cash provided by operations was $57.3 million in 2011, which included the impact of pension contributions. Higher earnings and working capital improvements were more than offset by the $107 million after-tax impact from the pension contribution, resulting in lower cash flow than the previous year. Our liquidity position and balance sheet remains strong. Our debt-to-capital ratio increased to 30% compared to 23% at the end of 2010, as we borrowed on our credit facility to purchase Lochinvar. Our funding sources are solid and stable. We have sizable cash balances located offshore, primarily related to the sale of electrical products, limited amortization of our long-term debt portfolio in the coming years and a $425 million credit facility, which does not expire until November 2013.
In addition to $463 million in cash at the end of December, we have $61 million of capacity unused on our credit facility and unsold RBC shares valued at approximately $160 million. Capital spending for the year was $53.5 million, and depreciation and amortization expense was $47 million. We purchased 611,000 shares in 2011 at an average cost of $38.69 per share or $23.5 million as we recognize that our market valuation on our shares dipped significantly below our historical long-term average enterprise value to EBITDA multiple.
Paul will introduce our thoughts on 2012 guidance in a few minutes, but as we finish our recap of 2011 performance, I thought it would be helpful to show you some of our assumptions for 2012 alongside our 2011 data.
We expect operating cash flow to be significantly higher in 2012 and to range from $145 million to $155 million, primarily because we do not expect to make a pension contribution. In 2012, we project our capital spending will be between $80 million and $90 million, with over half of this expected to be in Asia. 2012 capital spending includes approximately $40 million to begin construction of a second water heater manufacturing plant in Nanjing, China, to meet local demand. When complete, the new plant is expected to add 50% more capacity to our China water heater operations. We also plan to begin expanding our plant in India to accommodate production of more water heater models and to in-source some component manufacturing as we build scale to meet local demand.
Depreciation and amortization expense was $47 million in 2011. It will be higher in 2012, primarily as a result of higher depreciation and also amortization of intangible assets related to Lochinvar. Our effective tax rate was 31.1% in 2011, and we estimate the rate to be between 30% and 31% in 2012.
I mentioned that we do not expect to make a contribution to our pension plan, which is underfunded by about $150 million at the end of 2011. Lower investment returns, a reduction in the discount rate and the amortization of investment losses experienced in 2008 will result in significantly higher pension expense in 2012 as compared with 2011. We project 2012 pension expense to be $13 million to $14 million. The incremental impact to 2012 earnings from higher expense will be approximately $0.13 per share. Our corporate and other expenses excluding the gain in value of our hedged RBC shares were $45.5 million in 2011, and we project those will be similar amounts in 2012.
One final comment before I turn the call back to Paul. We evaluated our segment reporting after the sale of EPC and the purchase of Lochinvar and determined that reporting 2 geographic segments would more closely align our reporting with how we manage our business. We will report the results of our North American legacy water heater business and Lochinvar in our North American segment and our China, India and Europe results in our rest of world segment. We will introduce our new segment reporting on our 10-K, which we expect to file on or about the end of February. Paul will now discuss our guidance for 2012 and provide an update on our growth strategy.