Which type of solar water heater is better, the leaking heating pipe or the non-leaking one?

Both types of pipes have their own advantages and disadvantages. The cost of heat pipes that do not leak water is higher, so the water heater they are equipped with is also more expensive. The cost of water transfer is low and the selling price is also cheap. It's an advantage. Generally speaking, most water pipes are equipped with drip-type solar water heaters, and heat pipes are generally equipped with pressurized solar water heaters. Both of these have their own advantages and disadvantages. Think clearly about your main needs? Buy one of any type. Advantages of the drip type: low price and wide availability of hot water. The downside is that the water pressure is low, the large shower head cannot spray, and a pump is required. The pressure type is the opposite.