Indirect Water Heater Help - Caber???

[Hooter]

Hi there,

I have a boiler system that also heats the water in my hot water tank (ie indirect water heater). I also have a hot water recirculating system to my second floor so that I get hot water pretty much instantly from any faucet upstairs. My problem is that when I get up in the morning to have a shower I turn my faucet on and get hot water, but within a minute or so the water gets cooler so I have to turn the lever to get more hot water. Then after another 30s to a minute then I have to turn the lever again. I have to keep doing this until I’m almost at maximum hot water, and then I can shower comfortably till the end of my shower.

My question is this: why do I have to keep turning the hot water up more and more to keep the temperature the same, then it stays at a comfortable temperature for 10-15 minutes once I’m nearly maxed out on hot water? FYI, it’s been this way since my house was built about 4 years ago. I’ve just put up with it till now.

Any help would be appreciated. Thanks.

Trevor