New house and can’t figure out which pipe to attach the washer inlet pipe too , sorry if it sounds dumb only done it under sinks before, this is the only place it can go as well
Second pipe in from the right looks like the cold feed to the domestic water, it goes to the blue tap. You could use this as a cold supply, not much room to work though.
Getting it wrong at best would be annoying, but if you cut into the gas pipe it could be disastrous. Unless you really, really, really sure you know what you’re doing leave it alone and get a plumber to do it for you.
Having said get a plumber if you’re unsure, working on sites I have seen water coming out of gas hobs, gas meters removed to shake the water out of them, toilets flushing hot water because they have been connected to central heating systems or hot water supplies, and just about every other possible combination.
Sorry, I’m a little confused here.. are you asking which pipe you should connect a washing machine mains water supply to? If so, then it’s best you find an alternative connection point, as the fact you are even asking this question is worrying. Please leave the boiler plumbing well alone and take another look under the kitchen sink. You can get longer washing machine hoses if you need to plumb in a washing machine further away from the sink. The boiler mains water supply pipe may seem convenient, but also consider the drainage pipe that will also need connecting.