What type of insulation should unfired water heater storage tanks have?

Unfired water heater storage tanks should have R-12.5 insulation to ensure proper energy efficiency and heat retention. This level of insulation strikes a balance between effective thermal resistance and practical availability in the market.

R-value measures the insulation's resistance to heat flow, with higher numbers indicating better insulating properties. The R-12.5 insulation specifically helps minimize heat loss, allowing stored water to maintain its temperature over longer periods, which is essential for optimizing energy usage. This reduction in heat loss can lead to lower energy bills and increased efficiency in heating water when needed.

Other levels of R-value, while they may offer greater thermal resistance, might not be cost-effective or necessary for the typical operating conditions of an unfired water heater storage tank. Therefore, R-12.5 insulation is generally recommended as the standard for achieving optimal performance without incurring unnecessary expenses.