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[CountryBoyJohn]

I thought you said you were using a side arm AND a 20-plate??  Something is NOT hooked up right of you're running out of hot water with a plate exchanger!!  Did I read that wrong?

[mlappin]

Let's work on that hot water shall we? You said your sidearm is 4 -6 inches above the relief valve, can we raise the tank and drop the sidearm down so the top of the sidearm comes directly horizontal to the relief valve.

More of a problem of the power vent. I've been looking at redoing it and coming off with a ninety to the west, then another 90 to the south so I can pick pup the side arm. Side arm is on the south side of the water heater by the way. I can't go straight south from where the anode rod was because of the power vent.

[mlappin]

I thought you said you were using a side arm AND a 20-plate??  Something is NOT hooked up right of you're running out of hot water with a plate exchanger!!  Did I read that wrong?

Most entirely my fault, I meant I'm thinking of running a hybrid as in adding a plate exchanger. Other than cost I think you would have the best of both, sidearm would have 40 gallons of hot water ready in the off peak times and when you weren't using that much hot water the plate exchanger wouldn't be dropping the water temp from the boiler and when we're using an excessive amount of hot water the plate would take over.

[slimjim]

I see, 90's will not effect the flow but being above the relief valve will as there will always be a problem with an air pocket at the high point.

[CountryBoyJohn]

Ok, I see.  Mr. Yoder runs both.  I have enough usage that it's not worth it for me.  I've been gone as much as 3 days and still have to add cold water to my shower when I get back.  Like I said earlier, if I am gone for more than 3 days, I just run my tub for 3 or 4 minutes and I'm back in business. 

If you already have a sidearm, I'd go ahead and add the plate.  If I was starting out, I would do the plate and not worry about the sidearm.

[mlappin]

I see, 90's will not effect the flow but being above the relief valve will as there will always be a problem with an air pocket at the high point.

One of the nineties' has an auto vent in it. Have never had airlock issues.

[whitepine2]

 Have used the HX when installing new to me boiler,unreal never ran out of hot water. When new boiler was installed also installed an 80 gal. water store have never ran out of hot water ever. In winter with OWB running all hot anyone could use always. In summer I can get 3 sometime 4 days of hot water depending on usage like someone said several loads of whatever,when water gets cooler just flip switch and in 5 min water temp is up from boiler,this worked for me all last summer very little oil and good to run oil boiler some.
        Whitepine2  P&M 250 best investment ever as well.