What I do is put a fan heater on a timer to come on for 15 mins every hour from midnight on till when I start at 5.30 am ,works great,,or another tip lay over your pumps ,pipes and hose reel a cheap (argos £14 ) electric blanket or use the one on yer bed if you can get away with it ,stick it on low or again on a timer and like me no more solid pipes in the morning !!(unless it's 20 below of course,then if it is bring the van in the house,that works too !!)