low water cut off needed for residential hot water boiler?

Don. Freeman

Boiler installed on 1st.floor level of a residence with baseboard hot water heating including the basement level .
If the system lost water pressure from a problem in the basement what might happen? Would the relief valve prevent a disaster?
B149 Canadian code says boiler must conform to boiler and pressure vessel regulations. My research so far says that a commercial boiler must have a low water cut off but a domestic boiler is excluded from that code?
Any advise ?

RonHG

relief valve takes care of high pressure or high temp. low water cut-off keeps boiler from firing dry.

Ranger

In New Jersey..

..it is code.Use M.M. M/N:RB-24 or RB-122.Or Taco M/N:LT or LN.

Weezbo

theres the code and then theres your Standard.

let the code catch up...it could happen...:)

Robert O'Connor_7

LWCO?

A Low water cut off IS required on ALL boilers, commercial ones (depending on size) require two...Robert O'Connor/NJ

Brad White_2

Is that new?

I had always had it that a LWCO was required on all boilers with an input of over 300,000 BTUH and where any radiation was below the boiler installed level. This was per ASME. The 300,000 rule has been taken as "residential" versus "commercial" but has nothing to do with application.

Still, for peace of mind at a ridiculously low cost for what it can save you, a LWCO is cheap insurance.

Maybe as you say it now applies to all boilers. I specify them on all regardless, not as a code per se, but as a condition of "best practice" and as a "standard of care".

Don. Freeman

LWCO

Thanks to all replies and suggestions
(Ranger)- Please explain the shortforms?
Need suggestions for best LWCO to install for a small 100M Btu boiler,and web site to view.

Wild Bill

LWCO

Please advise 24V or 120V
Steam or Water???
Answer these and i will give you model number and website

hr

Why not

plenty of brands to chose from these days. Very affordable insurance as Brad mentioned.

Make sure you don't mount them where they can get air locked, and use the correct tee so they don't bottom out and ruin the probe when you thread them in!

I like the M&M 120 volt Guard Dog. Simple to wire to protect the entire system, pumps and boiler alike.

hot rod

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Steve Paul

LOW WATER CUT-OFFS ON WATER BOILERS

Ron,
How does a water boiler relief valve offer any protection from high temperatures? Combination pressure and temerature relief valves on water heaters do, but on boilers the relief valve is only for pressure.

Don_44

I have always preferred the Hydrolevel. Their 170 is unmatched as far as contact ratings, never had a problem with them. Others work as well, this is my preference.

Robert O'Connor_7

Lwco..

I too prefer the M&M 115v cut off, the 24v ones always seem to leak, must be that plasticy material they use....Robert O'Connor/NJ

Don. Freeman

LWCO

I"m thankful for your tips and suggestions. This is a 20 yr.old nat.gas 24 volt hot water Weil Mclain boiler that came with a prefab house set on a foundation with a basement. The orig.installer didn't use a LWCO which troubled me when I saw the installation last week.

ernie_3

I beleive...

Anytime the boiler is above its radiation, there should be a LWCO. Makes sense doesn't it?

Ranger

Here,Here...

...vote number three here for the RB-122.Good deal.

Ranger

Hey Don...

...as explanied below I first listed the McDonnell Miller
model RB-24 (24 volt) or the RB-122 (120 volt).I prefer the
RB-122.It has a brass probe (the 24v is plastic) and as Robert O'Connor has also stated,thay do tend to leak.I have not personally used a Taco yet but I'm sure there's will work just fine also.