Tankless water heaters

Hey guys and gals. I'm still new around here and I haven't been able to find out what most people do with there tankless water heaters once there boilers are up and running.I have a small one for DHW and a large one for my radiant heat in the house and garage. I'm wondering if you plumb around it or through it. I'm using propane currently and don't want the tankless Kicking on every time there is a calling. Im sure the s260 can handle the load all by itself. Any Info would be appreciated. Thanks everyone. What a great site

I'm installing an AHS S130 Coal Gun, and after many inquiries here I opted to heat my DHW with only the boilers internal coil and a mixing (tempering) valve. If that doesn't pan out I will go with an indirect HW tank and add a zone for it. You may find that you will no longer need your tankless water heaters.

I have an S130, and I use it for heat and DHW most of the year. In the summer I switch to either my electric hot water heater or I use my oil-fired boiler which also has a DHW coil. Yes, it is a bit of a plumber's nightmare, but it works. I like having options; so if I were in your shoes I would hang onto the propane unit for DHW use, at least as a backup.

I'm kind of looking for a tankless water heater. I'd like to be able to use it during the summer if it's cheaper than running the Axeman Anderson. If I were you, I'd keep one on line for summer time use.

Freddy wrote:I'm kind of looking for a tankless water heater. I'd like to be able to use it during the summer if it's cheaper than running the Axeman Anderson. If I were you, I'd keep one on line for summer time use.

I thought of one too, but their isn't a ng line to my place, don't really want a propane tank, and for and electric, they need 200 amps (the ones I see) that would take all my electric capacity just if the heater kicked on.

I can't even imagine running out of hot water using the DHW coil in the AHS-130 and we sure miss it through the summer months when I switch to the electric hot water heater.
Last Thanksgiving week there were 8 people in the house and I never ran out of hot water. I do remember most of the girls at the dinner table but most of the time one of them was in the shower

Thanks guys for the responses. Still curious how I should plum it. Would you bypass the tankless heaters with a valve or just run through them and hope they don't kick on and waste propane for no reason. Not sure how the tankless heaters work I guess.

I would bypass the tankless propane unit when burning coal. Pipe a bypass on the coal boiler's tankless coil as well...you don't want to send cold water through the coil in an idled boiler in the summer.

If you're in PA consider running your boiler year round. Even if it cost a little more you'll greatly increase the life of the boiler keeping it going 24/7/365. It really comes down to what you're paying for the coal. I figure it takes about 1 ton of coal extra over 4 months, just about makes up for what I'm going to be paying for electric anyway.

For sure, if I lived in PA I'd burn all year 'round. (And then I'd sell that tankless heater. I know someone looking for one )