Sorry, lot's of questions so we can help ~ !
We aren't sure where your experience level is so trying to hone in on how to 'splain
ok, having a heated hose may help with the water that's in the hose,
but if elsewhere has frozen, that COULD be part of the issue...
has your furnace (
NOT heat pump) been on the whole time it's been freezing ?
Let's make sure we are on the same page...
when you say low water pressure, what is low to you
?
an rv, by design cannot handle anything near what a house can - the max is 8somewherearound 60 psi...
Did you say you checked all the connections - the water filter is not stopped up, the water pressure is low throughout the rv or just in one place ?
ok - let's start at the source...
is there good water pressure outside at the hose bib BEFORE your heated hose ?
If so, next check after the heated hose,
if ok there, check your outside shower,
etc....
this is the water pressure regulator that I purchased
http://www.amazon.com/Valterra-A01-1...pressure+gauge
it allows me to see (and adjust) the water pressure...