Is there any commercial product that use static load or pressure to generate heat or electricity on contact surface? My idea is heat my chair when I sit without any external electrical source.
No.
Since the force applied is static, and no mechanical work is done (except in that first initial loading of the chair), then no heat can be created.
Think of piezoelectric materials - they generate a voltage (and can do work) when they are actively strained. When given a static load there's a transient voltage spike as they deform, but when the material is unchanging, there is no capacity for it to do work.
Static load refers to a constant load applied to a structure or material, which does not change over time. While static loads are not typically used to generate electricity or heat, there are some products that can harness the mechanical energy of static loads to produce power or heat. Here are a few examples:
Sudhanshu,
1) Piezoelectric materials yield a voltage when strained: when their dimensions *change*.
2) Can you explain how a mechanical load *that does not change* creates heat?
3) This is not how photovoltaic panels work. The quanta create charge carriers - and not because photons have 'weight'.
4) Heat exchanges operate by, as you say, the *flow* of fluids. And its the rate of heat transport, not the weight of a fluid, that allows them to do work.
The original poster is asking for an impossible thing. Barring chemical reactions or radioactivity, there are no ways in which a static mechanical arrangement can perform work.
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