I moved into a ranch home with a tankless water heater. I can get hot water in the bathroom immediately above the unit and to the clothes washer nearby it, but I can literally let the water run day long and not get hot water on the other side of the house to my kitchen or 2nd shower. What options do I have to provide enough heated water to take a shower or wash dishes at a distance from the tankless. I did have the water pressure checked and was told that it should be adequate to fire up the unit, yet it doesn't light. I've been thinking about adding some form of electric/ instant heater near the kitchen, but I'm reading that such a device will not be enough to provide the volume of water for shower use. unit is a Takagi Flash T-K2. Thoughts and suggestions needed. Thanks.
Yes the faucet could be a problem. Try changing for one which you know is ok.
The long run of pipework - each bend, elbow or joint all have a reducing effect on the flow, maybe enough to matter with a restricted outlet. none of this can be altered except by renewing with larger bore pipe - expensive!
Also there should be a dirt filter in the mains water input line/pipe. Try removing & cleaning. Try also removing , reconnecting and then the hot tap [faucet]
The boiler will have an actuator valve which fires it up when a certain flow of water is reached. If the flow is reduced AND the valve is worn, maybe a replacement. Not sure about it's USA construction but in the UK [it's called a diverter valve] many have a rubber diaphragm which is cheap to replace
Check also if it uses a flow sensor switch
Had a look at the Takagi web site and there are pdf's of manuals
takagi.com
Overall I am still thinking that the main prob is in the flow.
Hope I've helped - come back anytime
Rod.Davies
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The kitchen faucet and the bathroom shower may have less flow volume than elsewhere in the house. The 2nd bathroom sink will at times draw hot water/ other times not. There is absolutley no obstructions that I can see in the supply lines and all valves are wide open. Is it possible the faucets for the kitchen and shower are not allowing enough flow?
The pressure is critical to get the boiler to fire up but it's the flow [volume going through the boiler] which actuates the firing up What is the flow like at the 2nd shower /kitchen compared to the bathroom.If it's low check pipework and any obstruction [kink in pipe - service valve 1/2 on etc] Also, in the bathroom check if the boiler fires up when the a tap is partly turned on to give a low volume flow and let me know [email protected]
What you may have to do I sincere
Oops what you have to do is increase the size of the pipe. You have to get the flow.
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