Deleted User 298457
Deleted User 298457
Magnetic filters need cleaningFrom my experience they clean it out, ie some dust/soot. One did use some liquid once I think to basically help clean up the burner
I think its mainly really for rentals (safety) and warranty ie manufacturers imposing expensive servicing as part of package to support their approved installers having to pay them fees.
Ive never had anything changed as part of a boiler service (we rented for around 10 years and it was done annually and never had anything changed)