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That model of tankless probably has around 30 ft of head when flowing at the Max of 7gpm. The difference between the supply and return temp determines the flow through the tankless that’s why the readout is saying 3.5 gpm. What do the flow meters on the manifold say? The way that is piped, the...

Oh, The primary pump is placed where it is because it has to be placed nearest the point of zero pressure (the tank) and must “pull” through the spirovent. It then “pushes” into and/or past the closely spaced tees and into the tankless. The secondary also “pushes” through the floor then into the...

Yep. The TP is buried behind the piping under the tankless. This model has no internal circulator. It’s not a “boiler” it’s actually just a tankless hot water heater. The piping is Primary Secondary because the tankless systems have such a high head resistance in the exchanger. As far as what...

Yep- gas should be hooked up in the next week or so- see what happens

Here’s Mine. Almost ready to fill it and pull the trigger. Never realized how much math was involved to set one of these up. It’s gonna be heating a 30x40 garage that is well insulated but has 3 10’ garage doors. I put 1800’ of O2 barrier pex on 9” centers in a 6” slab, ran 6-300’ loops. I...

I just finished the plumbing of my radiant heat system. I’m running the numbers AGAIN (before startup) and looking for some opinions on what to expect when my primary loop has a lower gpm than my secondary. I expect the secondary to pull from its return to make up the gpm it needs from the...