Any heating guys that can lend a hand possibly

[CheaperthanYou]

Ok so in order to get us through this winter I needed to make a retrofit so to speak. My slab developed a leak, in our 1947 levit. on the main loop. we also have an extension in the back of the house that has a radiant zone. this was not leaking but I decided to abandon it to add some baseboards.
The pipe for that zone goes under my slab and under the staircase, where the pump, and expansion tank are located. this is piped in 1/2 copper.
I used this pump and expansion valve and capped off the radiant, and added 40' of baseboard. Using 3/4 pex (o2 barrier) to pipe the system
I bled the system a lot. closing the boiler return and opening the purge valve before the boiler return. the pump comes on when called for heat, and the boiler temp gauge is 180 (what the aquastat is set at) the pressure is 27 psi hot, and about 20 cold.
I just done seem to have the heat output that I would assume, the supply is 140 and the return is 80 (this is measured with a IR gun) we don't use the boiler for DHW we use electric for that
any help would be greatly appreciated. no one even wants to touch this system. this is just a fix for the winter, as I will be moving the boiler, to the garage come the spring (and money)

 

[CheaperthanYou]

more

 

[BoiledOver]

Maybe you are not seeing accurate temperatures. The one thing I am confident in speaking on is the IR temperature reader. They are finicky about the surface they will read accurately. Try applting a piece of black friction tape on the surface you want to know the temperature and that will be your target. I found the results to be quite different and was scratching my head for a while until being turned on to the finicky nature of these devices. Flat black paint will also work and be quite accurate.

 

[CheaperthanYou]

I have some friction tape. Ill give that a go

 

[TCaldwell]

if mixed[design] temp is 140, that is low for baseboard performance requirements, if you are reading 40deg less at the supply header than the boiler then probably it is a measurement error, however a 60deg delta from baseboard other than at zone startup seems high.