If on a well, you can install a regulating valve in the line to help with this problem. You may have to play with the valve a little to find the right pressure to avoid those highs and lows. I installed a Bosch A125 and had this problem from the start. A little research un-earthed the regulating valve (I think around $25 at Lowe's or Home Depot) and we have had even hot water ever since.
Unfortunately, this is not a great solution, but I think I know what your problem is. I suspect you are on a well or a public water system where the water pressure varies and this corresponds to the hot/cool cycles you are experiencing from your tankless system.
A conventional H/W tank mixes the water and buffers the water temp unless you use all of the H/W. Most, if not all tankless systems have no buffering and the pressure differences cause flow volumes to vary and the corresponding temp drop is not compensated for by your equipment. At the moment, I am not aware of any home consumer tankless systems that do this properly (or at all).
My solution that I am attempting at this time is to buffer with a small H/W tank that uses the output of the tankless system and causes the hot/cold cycled water to mix. I have a space problem and do not want to return to a full sized H/W tank. I don't think saves much $ initially (the cost of the small H/W tank and a tankless system), but should save the cost of heating a full sized H/W tank over time. It should save some space as I can wall mount a small H/W tank and gain some floor space.
Had the same problem with mine --one of the igniters was bad. Had to replace it...
This powerstar is a tankless heater? in a house ? I don't think a tankless can provide / respond yhat quikly to jhigh f;oe. that is why the hoot, cold, cycling.. good luck, but if this is a residential installation, Go with a tank.
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It is in a house. It is for two people only. Your answer is not quite literate enough for me.
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