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[EE Farm Boy]

How do you guys measure the temp drop from the boiler to the home plumbing accurately?  I have a 150' of logstor pipe and the aquastat says 190 on the boiler but my watts dial at entry to the home is saying 180.  I know that its would be impossible to loose this kind of heat through the logstor pipe but it does have me wondering? 

[RSI]

It is almost impossible to readings that are exact when you are dealing with less than a couple degrees difference. Try insulating the gauge as good as possible and see if it picks up a few degrees.

Unless you have the gauge in the line at the boiler, it will probably read different. All the water in the boiler isn't always the exact same temperature.

Also, if you can't watch both ends at once it could change due to a heat load coming on in the house. The return line will affect the supply a little usually.

[slimjim]

 

[mlappin]

Unless you have the gauge in the line at the boiler, it will probably read different. All the water in the boiler isn't always the exact same temperature.

The waste oil boiler I built has the thermowell for the Ranco in the top, it supplies water from the bottom, I have a set of dual readout temp gauges at the 50 FPHE, usually there is 3-5 degrees difference between what the Ranco says and the temp gauge at the HE. All lines are insulated, so there is a difference between the water temp that the pump is pulling and what the temp is at the top of the boiler.