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Posted by HeatPro on October 18, 2005 at 22:46:03:
In Reply to: should we upgrade to a modulating boiler? posted by Dave on October 02, 2005 at 10:31:26:
If this is the same Dave that emailed the pictures to me in January, the same problems occur due to not changing to a more useful piping arrangement.
It is less expensive to get a ErgoMax hot water tank in the primary loop and run the separate zone loops for the heat exchanger coils as they are.
The major noise problems come from trying to run low water volume in an eight-foot-long 2-inch loop instead of using the tank to buffer sufficient water volume in the primary loop. When only the water heater calls for heat in the summer, 1/5th the load of the 300,000 btuh Lochinvar is used and the unit can't be turned down enough to prevent noises.
The Weil Mclain Ultra will stop the noises as it can modulate way down to the water heater load as is and then increase load as the other zone heat exchangers kick in. However, it is far more expensinve than just to change the tank and run the primary loop through the ErgoMax tank.
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