We recommend a Kissing Gutter System as this keeps the Patio water separate from the house water and this can eliminate any issues you may have with adding extra water to your house. The Box Gutter System combines the Patio water and house water together. This can be a problem if leaves blow in and cover the mouth of your downpipe as this may cause overflow into your eaves. We recommend a Kissing Gutter System as this keeps the Patio water separate from the house water and this can eliminate any issues you may have with adding extra water to your house. The Box Gutter System combines the Patio water and house water together. This can be a problem if leaves blow in and cover the mouth of your downpipe as this may cause overflow into your eaves.