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Old 10-11-2011, 15:28   #1
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Seaward F700 Scalding Hot

It would appear that there is no way to adjust this. Are there any mods that anyone knows of to make this little bugger a little less scalding?

Every time we take a shower the pump seems to cycle hot then cold so that one minute you are blistering then freezing.
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Old 10-11-2011, 16:00   #2
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Re: Seaward F700 Scalding Hot.

The newer heaters have a thermostatic element to control tank hot water temperature on the engine recirc line. However another way would be to add a thermostatic mixing valve on the hot water discharge. This would control the discharge water temp. You run a cold water and hot water to the valve and connect the distribution to the discharge port.

Recomend a 1/2" valve even for 3/4" tubing.

Heres one link to a watts model
http://www.amazon.com/Watts-MMV-UT-M.../dp/B003L9N13U

Other types would work too. Avoid a tempering valve which may seem to do the same thing, but the thermostic mixing valve will control the discharge temp much tighter.
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Old 10-11-2011, 18:57   #3
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Re: Seaward F700 Scalding Hot

Those things are $120! Why the hell didn't they just use an adjustable thermostat in these things instead of a fixed one? Scalding hot I tell you! Maybe there is an adjustable one I could get to install into this unit. It seems like a simple enough job.
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Old 10-11-2011, 20:12   #4
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Re: Seaward F700 Scalding Hot

Well A little surfing will find the valve for around $75. I think the problem with the typical adjustable thermostats like you find on a residential electric water heater, for example is that they are not rated for a moist salt air environment.

The problem with the fixed set point thermostat switches is they are +/- 8 degrees. They are however in a sealed can so not very effected by salt air. You might try an appliance parts counter. You would want a thermostat switch rated for 110 degrees F. Not sure they are made that low. Might be hard to find.

FYI The threshold of pain on skin is about 120 degrees F and that decreases as we age. For those above retirement age, 100-110 degrees F. would be the most to set a thermostat at.
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Old 11-11-2011, 06:58   #5
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Re: Seaward F700 Scalding Hot

Quote:
Originally Posted by unbusted67 View Post
Those things are $120! Why the hell didn't they just use an adjustable thermostat in these things instead of a fixed one? Scalding hot I tell you! Maybe there is an adjustable one I could get to install into this unit. It seems like a simple enough job.
Even if you could adjust the temperature of the Seaward, you would still have the problem of warm/freezing cold cycling. The mixing valve will solve this.

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