ITEM NAME:Hot Stainless Steel Electrical elements Booster for Water Heater DN25 4000W F3B2 Hot Stainless Steel Electrical elements Booster for Water Heater DN25 4000W F3B2 Package include: 1 x Stainless Steel Booster for Water Heater Use stainless-steel Booster for Water Heater if your water do not contain alkaline. Hot echoing quickly,integrating hot effect is good,high heating temperature. Temperature control is good,compliance in high efficiency. Durable and convenient to use,easy to install. Application range: suitable for all kinds of solar water heaters, air source heat pump heating, water heater, water tank, boiler, steam heating machine Type:DN25 Electric power:4000W Length:4000W - 275mm Color:as shown Warning: This item id used for heating the liquid,prohibited to dry burning or dehydration use. It should be placed in the air-dry place if not used for a long time. Place in a sealed plastic bags in a wet environment. It can be dried in 200 degree oven when the insulation is low