Water is used in household radiators instead of oil because of high specific heat and high heat of vaporization. Water is also cheaper than oil.
No the Romans didn't have radiators, instead they had underfloor heating which slaves used to put wood into them to keep the fire going.
Water is used as coolant in car radiators because it has high specific heat capacity of 4200 Joules. It has the highest specific heat capacity than any other substance. That is why it is used as coolant in car radiators
Water isn't used in car radiators, radiator fluid is. that is used because it is a liquid of the right density to hold radiated heat from the radiator and pass it around the car where it is needed.
Eethylene Glycol
Antifreeze is a substance such as glycol which is used to lower the freezing point of water, and is used as an additive in the radiators of motorcars.
Water and antifreeze mixture. The antifreeze has additives that help prevent corrosion.
As the pumped fluid carrying heat form the boiler to the radiators.
Silver is a valuable metal, and is thus not used in radiators.
Household ammonia is a solution of ammonia in water. Mostly it is used to clean household utensils.
Water in household is primarily used for bathing. Water is also used in washing utensils. Good amount of water is used to run washer as well.
Distilled water IS good for radiators. In fact, manufacturers recommend using nothing but distilled water to mix with antifreeze. Tap water contains minerals, which can promote corrosion. So tap water should be used in a cooling system only in case of an emergency.
Vertical radiators have the same function as traditional radiators, they are used to transfer heat to the surroundings by radiation. Vertical radiators are seen to be more contemporary and tend to be used in modern bathrooms. Some are designed so that towels can be folded over the radiator, giving it a duel function.