My water heater doesn't turn on when a water filter is installed and turned on at that sink. If the filter is bypassed the hot water heater engages. The water heater also doesn't turn on in the shower when a showerhead is installed. It's like there is too much back pressure or restriction so water doesn't flow through the Power star fast enough to cause it to power on and heat the water. Is this a problem with the water heater or the bladder tank providing pressure to the whole house? The water pressure is 53 psi. Thanks for your expertise.