Yes. Some washing machines have both hot and cold inputs, though it seems less common nowadays. My gas combi-boiler heats water more cheaply than my washing mac

Yes. Some washing machines have both hot and cold inputs, though it seems less common nowadays. My gas combi-boiler heats water more cheaply than my washing machine, so it makes sense to use it. However, washing machines use much less water these days so perhaps the savings are marginal now.