Need help?Do you have a question about the Aqua-Hot 450 D and is the answer not in the manual?
Explanation of symbols used for safety and important information.
Details the identification label on the Aqua-Hot unit.
Step-by-step guide for turning on the Diesel-Burner, Electric Element, and Engine Preheat.
How to adjust interior room thermostats for zone heating.
Instructions for adjusting the thermostat for bay heating to prevent freezing.
Guide on how to operate the continuous hot water system.
Procedure for checking the antifreeze and water heating solution level.
Steps to refill the expansion tank with antifreeze and water solution.
Recommendation for annual tune-ups of the Diesel-Burner for optimal performance.
Detailed instructions for preparing the domestic water system for freezing temperatures.
Procedure to remove winterization protection and prepare the system for use.
Basic checks to perform if the Aqua-Hot Hydronic Heating System fails to operate.
Explanation of indicator lights and reset procedures for the electronic controller.
Details indicator lights for overload, zone status, pumps, engine preheat, and electric heating element.
Guidance on using RV & Marine antifreeze, noting it's not for the main system but for winterizing.
Information on automotive antifreeze, its pros and cons for the Aqua-Hot system.
Explains freezing and burst points of antifreeze solutions and their relation to mixture ratios.
Step-by-step instructions for calibrating the refractometer used for testing antifreeze.
Procedure for using a refractometer to measure propylene glycol concentration in antifreeze samples.
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General