I am not sure what your provider requested, but when we discussed in hospital about home dialysis ( we did not begin it yet) they mentioned that if we leave in a high rise ( a condominium) we will need some insurance. I think that is flood isurance, so the hospital will not liable for damage if R/O or dialysis machine produce damage to the apartments below.
We checked with our home insurance, and are covered for food damage ( similar if a pipe leaks from the washing machine). I do not know if they want insurance for the device per-se, but I am sure that it can be included in content home insurance.