Hi Henk, I didn’t answer your questions earlier this week. A little further above I mentioned the Rheem wall mounted boiler. I looked at one at our local heating supply outlet; they are bigger than I had envisioned the unit. But yes they do talk about very high efficiency. The heating guys tell me that hot water tanks will soon be a thing of the past as we are about to be mandated by the building code to eliminate hot water tanks all together in new construction and move to these in line style heaters for higher efficency.greenthumb wrote:Have you investigated the new(ish) wall mounted condensing boilers? Supposed to be pretty efficient.
My good friend Dan also mentioned this too me. I went out and bought another elbow to sink a pex line out into the middle of the floor. In this dead head line (capped off) I will run a thermostat temperature probe. In this way the thermostat is reading the slab temp, and not the air temp. This can avoid the ups and downs experienced by the air temp changes. I am mindful however that I may need to one day supplement the building with a forced air heater anyway, for those cold days when you open the bay door.greenthumb wrote: In my experience you don't want water that is too hot in a floor hydronic system. The heat spikes after the setpoint has been reached are not comfortable (as well as a waste of energy). That slab acts as a giant heat sink and keeps radiating that heat after your setpoint has been reached if the water is too warm. Some type of mixing valve may be required depending on the temp of the hot water coming in. The hot water tank may just be the ticket, although not sure what the muni will think of that. Of course after the final, you can do what you like.
My thoughts exactly. If I go with a tank, and not a wall mounted unit, I do intend on placing this up the wall, on a raised edge platform, with a slope and drain back to the sink – I do understand that hot water tanks are not to be trusted!greenthumb wrote:A used tank could be had pretty cheaply, which would be less painful if it is inadequate. A tank replace is pretty easy if necessary down the road. One thing I would do is put a sloped drain near the spot you plan to have the heating source, in case of a failure down the road.
My .02 anyway.
good luck!
Thank you guys for your thoughts on the subject – really appreciate them.
Byron