I found some good tips on how to maintain and repair tankless water heater. I thought of sharing it because this can be useful to some of us here. http://www.tanklessdoneright.net/how-to-care-for-a-tankless-water-heater/
Aside from those 4 tips given, what other tips can you share?
I am using this one in my place. Additional option for you... https://www.tomtop.com/p-h9636.html?currency=PHP&Warehouse=CN&%7Bifdbm:aid=dc2dynamic&mid=10000008003&utm_source=SEM&utm_medium=DoubleClick&utm_campaign=$%7BINSERTION_ORDER_ID%7D&utm_adgroup=$%7BCAMPAIGN_ID%7D%7D&aid=gplaphcd..
I think your quotes should be base on your expertise. And how long would it take for you to finish the job. Offer your highest deal then, I'm sure they will ask for some discounts.