1 In the Format Cells dialog box, click Color, and then click the White square. 2  Click OK in the Format Cells dialog box, and then click OK in the Conditional Formatting dialog box. 3  Note Because you selected column A in step 2, all the cells in column A were formatted with this conditional format. In the Format Cells dialog box, click Color, and then click the White square. 2  Click OK in the Format Cells dialog box, and then click OK in the Conditional Formatting dialog box. 3  Note Because you selected column A in step 2, all the cells in column A were formatted with this conditional format.
With maintainance a boiler should last 15 years. A combo boiler is used more than any other boiler because of constant demand.A heat exchanger replacement you have to consider age and shape of unit.ith maintainance a boiler should last 15 years. A combo boiler is used more than any other boiler because of constant demand.
I have to partially disagree. Steam heat systems CAN last as long as hot water heat. But,where hot water boilers may have a 20 year or lifetime warranty, steam boilers have one year.t probably depends where you live. My sister lives in CT, her house was built in 1890, most if not all of the black pipe is original as are the radiators. She has steam heat, which is more corrosive then water. We have a house built in 1929 with black pipe and hydronic heat. The pipe looks good as new.