Weil McLain HE II-5 Gas Boiler with Indirect Water Heater

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hags428

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Hello. I was recently over a friends house and he has a Weil HE II gas boiler with a indirect gas water heater that is used for a two zone hot water baseboard and for his domestic water as well. The aqua stat is set to 180 and the water at the sinks, bath, etc is way too hot. Is the best way to have to domestic power temp by installing a thermostatic mixing valve? I attached some pictures. Again if it was me I would just turn the cold up a little in the shower. I don't want him lowering the temp on the boiler and causing damage. The boiler was manufactured in 1996. I have a tankless water heater and a force hot air propane furnace. I am just trying understand the concept of the design and what's the best way to get the domestic water lower
 

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Fitter30

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See that there's a pump behind the boiler. Need to look at the wiring of the pump should be a thermostat on the tank also there might be a controller for the zone valves or pumps with priority for hot water tank.
 

John Gayewski

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How are the zones controlled? It could be a zone valve stuck or an aquastat stuck.
 
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