When pressure washing your home or other surface, you can either use cold water or hot water. Hot water pressure washing and cold-water pressure washing are almost identical in every aspect except for the heat. However, there are times when you want to use one over the other.
One instance where you want to use a hot water pressure washer is if you are trying to remove grease or oil stains because hot water really helps to remove these in a way that cold water cannot do. It is similar to how you soak greasy pans in hot water, not cold water. However, some materials and surfaces are sensitive to heat and in these cases, you want to avoid hot water pressure washing.
On the other hand, if you are just trying to blast away dirt, grime, or debris, a cold-water pressure washer is just fine for the job. There are also many accessories, such as brushes nozzles, detergents, etc., that can boost the effectiveness of your cold water pressure washer and can even help it tackle grease and oil (although it likely still will not be as effective against grease and oil as a hot water pressure washer).
Additionally, if you are constantly pressure washing, you may want to consider a hot water pressure washer as they tend to clean faster and will therefore save you time. If you are simply planning on doing small and infrequent cleaning tasks with your pressure washer, a cold-water unit is likely fine for you.
Before buying a hot water pressure washer, you should consider if you really need one for what you are going to be using it for. Because hot water pressure washers are heated, they also tend to be bigger, more expensive, and harder to maintain than cold water pressure washers. If you only need a hot water pressure washer for a small and infrequently done task, you may want to consider renting one instead of buying one.
In conclusion, cold and hot water pressure washers have many similarities, but they also are best used in different scenarios. It is important to select the best one for the job at hand.