Weil Mclain Domestic HW Coils

[daveyd]

I have a Wwil Mclain boiler with a Summer/Winter hookup. Whenever there is a hot water demand at more than 1 source there is a big pressure drop and usually the closest demand gets the hot water. The domestic water feed tube is 3/4" and the domestic HW tube out of the water heating coil is 3/4" but the coil is 1/2". As far as I know WM dosn't make a larger coil. What can I do?

[oil lp man]

You may consider having a Super Stor Indirect water heater installed. How old is the boiler?

[daveyd]

The boiler is about 17 years old. I have seen the Weil Mclain indirect water heaters, which I imagine are like the one you mentioned, that act as an additional zone to provide hot domestic water but they are a little pricey and I wasn't sure if the one circulation pump could handle a fourth zone.

[johnsp]

I always put a seperate circ on an indirect to get full flow. You could look at a glass lined indirect to save a few dollars. Super store contender, crowm maxi-therm and bradford-white all offer glass lined tanks that should last 10-15 years. Then replace both at the same time.

[daveyd]

Sounds like a plan. Thanks.