Coolant and Heating - Heater hoses
Replacing heater hoses
Cruz: If anyone needs to replace their front to back heater pipes they need at least 3.5 metres (each) of good quality GP80 heater hose with a 5/8" (15.875 mm) internal bore diameter.
Insulating heater hoses
HarryMann: Insulate heater hoses for quicker heater warmup in winter and less heat to under-floor areas in summer
In this instance I used Screwfix 2" bubble/foil tape, spirally wound, stopping it off with their 2" ally foil self-adhesive tape. Results? Easy to fool oneself - but I also wanted less under cab-floor heat in summer, so convinced myself heater warmed up quicker in winter, which theoretically it does !