Hi,

I am trying to replace my Watts 70A Tempering valve on my boiler. It's leaking. The instructions say to bleed pressure from the system after turning off the hot and cold water. Can anyone tell me how to do this on a Weil McLain boiler with Beckett Burner.

Thanks,
Steve

 

Hi.

Before you change that valve what are you replacing it with? That 70a is not a good thermostatic valve. In fact I dont think its thermostatic at all.

This is preferred. 80-120F. (you really dont want hotter then 120F) integrated check valves etc.

0206000 - Watts 0206000 - 1/2" MMV-US M1, Sweat Mixing Valve

If you need hotter water the tacos have a larger temp range. Might take longer to dial in the temp.

5002-C2 - Taco 5002-C2 - 1/2" Sweat 5002 Mixing Valve

Anyway, just turn off the hot and cold valves for the domestic hot water and open a H/C faucet to relieve the pressure. There should be valves around your boiler for this, possibly near the mixer or coil. If not shut the water feed to the boiler, then shut the house main off. Then open a faucet. Replace the mixer, then turn the main on and then your boiler feed. I say to turn off the boiler feed so you get no backflow into the potable plumbing when shutting down the main.

Hope this helps.

Mike NJ

 

Thanks for the reply and suggestion re: other valves. I think we will stick with replacing the original Watts 70A with same for now as we are considering converting from oil fired boiler to gas boiler -- as soon as we receive estimate from gas company to run line to the house.

Thanks again.
Steve

 

Oh so you may be getting a HWH soon????

Mike NJ

 

I think what Mike is driving at is that you are making domestic hot water with your existing boiler. And you are planning on replacing the boiler... and that your new boiler will NOT have a 'thankless' coil in it because it is the absolute WORST way of making hot water in the world... well, maybe not exactly the worst... lighting a wood fire in the back yard and carrying in kettles of hot water to pour in the tub might be worse...

And, that replacing that POS valve with the same is a waste of time and money... because even if you do get a new boiler with a 'thankless' coil, you will still be faced with a crappy mixing valve.

But, you shouldn't even consider replacing the boiler and staying with the same method of domestic hot water...