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Repair or replace your boiler?

Compare your two quotes. A newer condensing boiler gains little from replacement, so repairing is often cheaper.

Fitted, for a new gas boiler
When was your boiler fitted?

Gas boilers fitted since April 2005 have had to be condensing. A condensing boiler has a plastic flue pipe and a small waste pipe running to a drain.

Change assumptions
On your bill or annual statement. Default: Ofgem typical use.
If you know it, for example from the Product Characteristics Database

A new boiler at 85% real-world efficiency, as in our heat pump calculator. Gas at the price cap unit rate; standing charges are the same either way.

Enter both quotes to compare.