small amount
gas valve and pilot assebley cost more
The thermocouple is going bad. The thermocouple is the small tube that sits in the flame from the pilot light and goes back to the gas valve. They are easy to replace and cost $6 to $8. For health and safety the failing part should be replaced without delay by a competent gas engineer.
The installation of a solar water heater will cost between $250-500.
30gal.hot water tank cost+installation
It depends on what is broken on your water heater, as to how much it would cost to fix it. It might actually need to be replaced and be more cost effective to replace it.
Change the thermocouple. -This is the device that keeps the gas open to the pilot and thus controls the regulator. They cost less than $10 and can usually be changed in less than an hour. If you haven't done it before I would suggest hiring a competent handyman to do it, or if you are quite mechanically inclined google it.
YOU DONT repair them
To replace the circulating pump it will cost between $150 and $300 depending on the hot water heater. It will also cost you labor fees if you have someone install it for you.
You can find more information about how much a water heater installation cost by going to a home improvement store such as Lowe's or Home Depot or going to their direct website.
mine cost £70 pounds and it came with light, filter and heater
$6 to $10 depending on where you are and where you get it from.
The cost of a water heater will depend on many factors, including the fuel source (electric or gas), as well as the style and size. Warranty and installation should also be figured into the cost. A good range would be $150 - $350 for the heater and $200 for installation.