Optimal Operating Schedule for DHW Circulation Pump for Efficiency and Longevity

Question

Hello, I have a pump installed in the domestic hot water system, which significantly increases the comfort of using hot water. I have it connected via a clock with a programmer. Initially, I had the operating time set between 6:00 a.m. - 10:00 a.m. and 5:00 p.m. - 11:00 p.m. I read somewhere...

Dacomos · Answer

Well, to control the DHW pump, it is probably a temperature measurement, not a time measurement

pawszka · Answer

maybe the temperature would be a more accurate value, but it would probably be more complicated to control the pump. It`s probably easier with the time trial?

zybie · Answer

Just 15 min/15 min is enough, it certainly won`t harm the pump.

Anonymous · Answer

Depending on what programmer you have. If you have something more than a regular 24-hour watch, you can have some fun, but;

What do you want to gain?
- savings - minimal (the only real savings are achieved by turning off hot water circulation)
- comfort - none
- saving the pump - not necessarily

pawszka · Answer

I believe that it is not just a matter of saving money on the pump. If the pump were to run all the time, the water in the tank would cool down faster and the stove would be turned on. And this already generates a gas bill.
The question is how to set it optimally?

Anonymous · Answer

If the pump ran all the time, in the intervals you wrote about, and by setting the interval at these times, the energy saved (costs of heating, pump operation, etc.) would differ minimally (it would be cheaper, but you would not notice it by that much).
We assume that you will be using hot water during this time. So the pump will cool the tank anyway and the boiler will heat up.
Ps. I am not writing the obvious, that instead of setting only momentary activation of the domestic hot water pump, it is better to ensure that the circulation pipe is very well insulated.

pawszka · Answer

I put what I could into the lagging. However, most of them are bricked up and heat the floors.

Anonymous · Answer

Exactly.

Circulation - greatly increases comfort. Unfortunately, it also increases expenses significantly.
It often happens that installers leave "bare" pipes, oversize the diameters, or brick up uninsulated pipes in the wall.

Later, people report that they have a very high gas bill and the boiler only heats hot water.

ogi4 · Answer

In new installations, the bell switch rings at each required hot water consumption, turning on the pump and holding it for the time needed for hot water to flow to the tap. In the old wireless remote control with a transmitter. This is the cheapest circulation operation and very effective.

pawszka · Answer

I set up a time trial that runs in the morning and evening. During the day you have to wait a while for hot water.

Optimal Operating Schedule for DHW Circulation Pump for Efficiency and Longevity

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