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.
The cost of a new combi-boiler will vary depending upon how large your system needs to be and where you purchase it from. For instance: 1  A Vaillant combi boiler purchased straight from the producer prices between GBP725 and GBP910.il boiler installation costs. If you live in a rural area, you may need to heat your home with an oil boiler, which costs more to install and run. For example: 1  A Grant Vortex Pro Outside gas combi-boiler costs GBP2, 310 plus between GBP600 and GBP1, 000 to match.